Before prohibition, cider was the most popular drink in America. Cider ferments when yeast eats sugar in the apple juice and excretes carbon dioxide and alcohol. Ingredients and Materials 1-gal. glass bottle*/† Airlock and one-hole stopper — either three piece or bubbler* Potassium metabisulfite* (optional sterilizer) Autosiphon* (optional) Four wine (700-ml) or eight pint-sized fliptop … More DIY Project — Apple Cider Fermentation