preserve · Preserve

How to Make Vinegar at Home

Making vinegar at home requires two fermentation stages: first, yeast converts sugars to alcohol, then acetobacter bacteria converts that alcohol to acetic acid. Start with fruit, wine, or alcohol, add time and patience, and you'll have homemade vinegar in 2-6 months. The process needs oxygen, warmth, and a mother of vinegar to work properly.

Ingredients

Step by step

  1. Choose your base liquid. Use wine, hard cider, or create sugar water with fruit scraps. For wine vinegar, use opened wine that's past drinking. For apple cider vinegar, blend apple scraps with water and a tablespoon of sugar. Avoid anything with preservatives or sulfites.
  2. Create the alcohol base if needed. If starting with fruit, ferment it first. Mix chopped fruit with water to cover, add a pinch of sugar, cover with cloth, and let sit 1-2 weeks until it smells alcoholic and stops bubbling actively. Strain out solids.
  3. Add mother of vinegar. Pour your alcohol into a wide-mouth jar, filling it only halfway. Add 1/4 cup unpasteurized vinegar with live cultures or a piece of vinegar mother if you have one. The wide surface area lets oxygen in, which the bacteria need.
  4. Cover and place properly. Cover the jar with cheesecloth or coffee filter secured with a rubber band. This keeps dust and flies out while letting air in. Place in a warm, dark spot between 60-80°F. A pantry shelf works well.
  5. Wait and watch. Leave undisturbed for 2-4 months. A film will form on top - that's the mother growing. Don't stir or move it. Taste after 2 months. When it reaches the acidity you want, strain out the mother and bottle the vinegar.
  6. Store the finished vinegar. Transfer to clean bottles, leaving the mother behind for your next batch. The vinegar will keep indefinitely at room temperature. Save the mother in a jar with a little vinegar - it's your starter for next time.

Tips & troubleshooting

Variations

Questions

How do I know if my vinegar has gone bad?
Real vinegar rarely spoils because of its acidity. If you see fuzzy mold (not the smooth mother film), discard everything. Properly made vinegar will smell sharp and clean, never putrid or rotten.
Can I speed up the vinegar-making process?
Heat kills the bacteria you need, so warming won't help. Adding more mother or using a larger surface area jar can speed things up slightly, but patience is key to good vinegar.
What's the difference between mother and the film on top?
Both are bacterial formations, but mother is thick, rubbery, and active in making vinegar. Random films can be kahm yeast or other bacteria - when in doubt, scrape it off and keep the clear liquid below.
Why isn't my vinegar getting sour enough?
Your starting alcohol might be too weak, or the bacteria culture isn't strong enough. Add more unpasteurized vinegar or wait longer - some batches take up to 6 months to reach full strength.

Further reading