How to Make Vinegar at Home: Apple, Grape and the Kinds You Cannot Make
Compiled and fact-checked from cited sources, reviewed by our editorial team. · Last updated:
Making vinegar is really two fermentations happening one after the other, and no recipe makes sense until you separate them.
In the first, yeast turns the sugar in fruit into alcohol. That stage happens without oxygen, in a closed vessel. In the second, acetic acid bacteria — Acetobacter — turn that alcohol into acetic acid, and this stage needs the opposite: oxygen, with the jar covered by cloth rather than a lid.
What people usually mean by “making vinegar” at home is the second stage. If you start with something already alcoholic — wine, cider — you get vinegar in a few weeks. If you start with fruit, you wait for the first stage first.
Knowing this also settles the two most common wrong expectations straight away: a tightly sealed jar will never make vinegar, and white distilled vinegar and real balsamic cannot be made at home — the reasons are below.
Which vinegars you can make, and which you cannot
Not every vinegar on the shelf can be reproduced in a kitchen. Starting without knowing the difference is how people end up disappointed six weeks later.
| Type | Possible at home? | Why |
|---|---|---|
| Apple cider vinegar | ✅ Yes | Apples bring both the sugar and the wild yeast on their skins |
| Grape / wine vinegar | ✅ Yes | Same principle; the oldest method there is |
| From leftover wine | ✅ Easiest | The alcohol stage is already done — only stage two remains |
| ”Raw”, “organic”, “natural” | ✅ Yes | Not separate types; just names for the above |
| White distilled vinegar | ❌ No | Made from distilled alcohol; distilling at home needs equipment and is illegal in most countries |
| Balsamic vinegar | ❌ No | The real thing is cooked grape must aged in a battery of casks for at least 12 years |
On white vinegar there is a persistent confusion: because it is clear, people assume it is somehow purer. It is simply made industrially by converting ethanol to acetic acid, and its colourlessness comes from the raw material. Homemade fruit vinegar will always stay amber, no matter how well you filter it.
Balsamic is even clearer. Aceto Balsamico Tradizionale DOP is made from 100% cooked grape must, aged in a series of shrinking casks of different woods for 12 years — 25 for extravecchio — and adding caramel is forbidden. Recipes online for “homemade balsamic” are really grape syrup mixed with vinegar. The result is a nice dark sauce, but it is not balsamic.
If you are deciding what to buy instead, the comparison is in vinegar types and prices.
What is the mother, and do you need one?
The mother is the gelatinous, slippery film that forms on the surface. It is not a fungus, despite the appearance: it is a cellulose mat produced by acetic acid bacteria, which live inside it.
You do not need one. Apple and grape skins already carry both yeast and acetic acid bacteria, and more arrive from the air once the jar is open. What a mother buys you is speed — a few weeks, and a faster drop in pH that keeps unwanted microbes out.
Three ways to get one: the sediment at the bottom of any unpasteurised, “unfiltered” or “with the mother” vinegar; a piece from someone who already brews; or simply letting one form on its own.
To tell mother from mould: the mother is smooth, jelly-like, off-white to beige and sits attached to the liquid. Mould is fuzzy, raised, dry-looking and shows green, black or blue. If you see mould, discard the batch.
Apple cider vinegar: two routes
Route 1 — From scraps (the practical one)
This is what to do with peels and cores instead of binning them.
- Prepare the jar. A wide-mouth 1-2 litre glass jar, washed in hot soapy water and rinsed well.
- Fill three-quarters with apple scraps. No rotten or mouldy pieces.
- Make sugar water. One tablespoon of sugar per litre of water, stirred until dissolved. The sugar is fuel for the yeast — peels and cores do not carry enough on their own.
- Pour it over. The fruit must be fully submerged; anything above the surface will mould.
- Add a weight. A small glass dish or fermentation weight keeps the pieces down.
- Cover with cloth and secure with a rubber band. Never a lid: air in, flies out.
- Keep it dark and warm (20-25 °C). Inside a kitchen cupboard is ideal.
- Stir once a day for the first two weeks, with a wooden or plastic spoon. Bubbling means the alcohol stage is running.
- Strain after two weeks. Discard the fruit, move the liquid to a clean jar, cover again with cloth.
- Leave another 3-4 weeks. Do not stir now — leave the film on the surface intact.
- Taste. Bottle when it is sour enough for you.
Route 2 — Whole apples
Gives a clearer vinegar with more aroma. Wash the apples but do not scrub them — the wild yeast is on the skin. Quarter them, fill the jar, and continue with the same sugar water. Add a few weeks to the timeline.
Grape and wine vinegar
Grapes are the original vinegar fruit, and no added sugar is normally needed.
- Do not wash the grapes — the white bloom on the skins is the wild yeast. Just pick out anything spoiled.
- Destem the grapes into a wide glass or glazed ceramic vessel, no more than two-thirds full.
- Crush them with clean hands or a wooden masher.
- Cover with cloth and keep warm and dark.
- Stir once a day for 7-10 days. The skins float and form a cap; pushing it back down prevents mould.
- Once bubbling stops, strain and discard the solids.
- Move to a clean jar and rest for 2-3 months, until the smell turns sharply vinegary.
- Strain and bottle.
From leftover wine it is faster still, and it is the best use for a bottle that has gone flat. Dilute it one part wine to one part water — at 12-14% alcohol the bacteria struggle, and the sweet spot is 5-8%. Add a mother or a glass of unfiltered vinegar, cover with cloth, and wait 3-6 weeks. Red wine gives red wine vinegar, white gives white wine vinegar — and neither of those is “white vinegar”.
How long does it take?
| Starting from | Alcohol stage | Acetic stage | Resting | Total |
|---|---|---|---|---|
| Apple scraps | 2 weeks | 3-4 weeks | 2-4 weeks | 7-10 weeks |
| Whole apples | 2-3 weeks | 4-6 weeks | 4 weeks | 10-13 weeks |
| Grapes | 1-2 weeks | 4-6 weeks | 2-3 months | 4-5 months |
| Wine | — | 3-6 weeks | 2-4 weeks | 5-10 weeks |
These assume 20-25 °C. In a cool house in winter it can take twice as long. The calendar does not decide when it is ready — taste does.
Equipment and conditions
- Glass, glazed ceramic or food-grade plastic. Acetic acid corrodes metal; avoid aluminium, copper and uncoated steel for both vessels and spoons. Stainless steel is fine for brief contact but not for long storage.
- A wide mouth. Oxygen enters at the surface; in a narrow-necked bottle the second stage nearly stops.
- Cheesecloth, kitchen paper or tightly woven fabric. Never a sealed lid.
- 20-30 °C and dark. Direct sun causes both heat and light problems.
- Do not disturb it. Moving or shaking the jar during stage two sinks the surface film and slows everything down.
How to tell it is ready
Three signals together:
Smell. All the winey, yeasty notes should be gone, replaced by a sharp, nose-catching vinegar smell.
Taste. The sourness should bite at the sides of the tongue. Any lingering sweetness means the sugar is not finished.
Acidity. A pH strip gives you a figure — finished vinegar usually sits at pH 2.5-3.5. But pH does not tell you the acid percentage, and that distinction is the whole point of the next section.
The pickling warning: homemade vinegar is not for canning
This is the single most important item here.
In pickling and canning, vinegar is not there for flavour. It is there to create an acidity at which the bacterium that causes botulism cannot grow. For that, the acid level must be at least 5% and uniform throughout the jar.
The acidity of homemade vinegar is unknown and varies from batch to batch. Two jars from the same recipe can come out at 3% and 6%. That is why the guidance from the US National Center for Home Food Preservation is unambiguous: do not use homemade vinegar, or vinegar of unknown acidity, for pickling; use vinegar labelled 5% acidity, and never change the vinegar-to-water ratio in a tested recipe.
Your homemade vinegar is excellent in dressings, marinades, drinks and cleaning. For jars that will sit on a shelf for months, buy the labelled bottle.
Refrigerator pickles and canned pickles are not the same thing. Quick pickles eaten within days and kept cold carry little risk. Jars sealed and stored at room temperature for months depend entirely on acidity. Use homemade vinegar only for the first kind.
Common problems
Fuzzy patch on the surface. Mould. If it is green, black or blue, discard the batch. It usually means fruit was left above the liquid.
Thin, wrinkled white film. Kahm yeast. Harmless but it taints the flavour. Skim it off, stir, and make sure the fruit is submerged.
Slippery, jelly-like layer. That is the mother. Keep it for the next batch.
Nothing is happening. Too cold (below 15 °C), jar sealed too tightly, or no sugar in the raw material. Check in that order.
Tiny wriggling threads in the liquid. Vinegar eels (Turbatrix aceti). Considered harmless but unappetising; heat and filter the vinegar and replace the jar and cloth.
Fruit flies. They are getting in at the edge of the cloth. Band it down properly.
Straining, bottling, storing
Strain first through cloth, then through a coffee filter. Bottle in glass and seal it tightly — from this point you no longer want oxygen, or the acid slowly degrades.
Stored cool and dark, it keeps for years. Sediment and a new mother may form over time; neither means it has spoiled.
For a longer, more stable shelf life you can pasteurise: heat to 60-70 °C and hold for 10 minutes. Do not boil — acetic acid evaporates.
Frequently asked questions
How do you make vinegar at home? Put fruit in a wide-mouth jar with sugar water, cover with cloth and keep it dark at 20-25 °C. Sugar becomes alcohol, then alcohol becomes acetic acid. Total time runs from about seven weeks to five months depending on the fruit.
Can you make white vinegar at home? No. White distilled vinegar is made industrially from distilled alcohol. Homemade fruit vinegar stays amber no matter how well you filter it.
Can you make balsamic vinegar at home? Not the real thing. Genuine balsamic is cooked grape must aged at least twelve years in a cask battery. Online “homemade balsamic” recipes are grape syrup mixed with vinegar — a nice sauce, but not balsamic.
How do you make apple cider vinegar? Fill a jar three-quarters with apple peels and cores, cover with water containing one tablespoon of sugar per litre, and cover with cloth. Stir daily for two weeks, strain, then leave a further 3-4 weeks.
How do you make grape vinegar? Crush unwashed grapes into a wide vessel, cover with cloth, stir daily for 7-10 days, strain when bubbling stops, then rest for 2-3 months. Extra sugar is usually unnecessary.
How long does homemade vinegar take? Three to six weeks from wine, seven to ten weeks from apple scraps, four to five months from grapes. Temperature changes everything, and taste, not the calendar, decides.
Do you need a mother to make vinegar? No. Bacteria on the fruit skins and in the air will do it. A mother only speeds things up and acidifies the batch sooner.
Should the jar be sealed? Never during the second stage. Acetic acid bacteria cannot work without oxygen, so a sealed jar will not produce vinegar.
There is mould on my vinegar — what now? Fuzzy green, black or blue growth is mould and the batch goes out. A smooth, jelly-like, off-white layer is the mother, which is what you want.
Can you pickle with homemade vinegar? You should not. Its acidity is unknown and inconsistent; canning needs vinegar labelled 5%. Use homemade vinegar for dressings, marinades and cleaning.
How do you measure the acidity? Properly, by titration, which is difficult at home. A pH strip gives an indication (finished vinegar is pH 2.5-3.5) but does not give the acid percentage.
What container should I use? Wide-mouth glass, glazed ceramic or food-grade plastic. Aluminium, copper and uncoated metal react with the acid.
Do you have to add sugar? Usually yes with apple scraps, usually no with grapes. The sugar is fuel for the yeast, not sweetening, and it is consumed by the end.
How long does homemade vinegar keep? Years, sealed and stored cool and dark. Sediment and a new mother are normal.
Why does mine still smell like wine? The alcohol stage has not finished. Move it somewhere warmer, make sure it is cloth-covered and getting air, and give it a few more weeks.
What is the difference from shop vinegar? Shop vinegar has a standardised, labelled acidity; homemade does not. In exchange, homemade is unfiltered and unpasteurised, so it carries more aroma.
Sources
- National Center for Home Food Preservation — General information on pickling (acidity and the homemade-vinegar warning). https://nchfp.uga.edu/how/pickle/general-information-pickling/general-information-on-pickling/
- South Dakota State University Extension — vinegar acidity safety in home canning. https://extension.sdstate.edu/safety-concern-vinegar-acidity-level-home-canning
- Institute of Culinary Education — How to make vinegar from home. https://www.ice.edu/blog/making-vinegars
- Acetaia producer guidance — the difference between Aceto Balsamico Tradizionale DOP and Modena IGP. https://www.acetaiamarchi.com/en/difference-between-traditional-balsamic-vinegar-of-modena-dop-igp/
