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How to ferment cider using wild yeasts
Buy some apple juice, either fresh or frozen.
If frozen, let it thaw.
Pour the fresh or concentrated juice into quart canning jars, any size jars, or any large glasses.
If it's concentrated, use about 4 ounces of concentrate per quart (one 12-ounce can for 3 quarts), and fill the rest of the jar with water. Leave about an inch at the top for the bubbles, otherwise you could have a mess on your cupboard.