The diagram below shows a simple schematic diagram of a do-it-yourself wine fermentation setup. Most wine beginners use the use the traditional cotton plug method. Its a big NO.
Fermentation occurs in absence of oxygen. Oxygen entry may allow the growth of foreign acetic acid bacteria. The setup below is ideal it allows escape of carbon dioxide produced by the action of yeast but prevents the entrance of oxygen.
You just need an extra rubber plug, piece or rubber tubing and small bottle of water.
Marvin is the lead chocolate maker of Ben and Lyn Chocolate Inc. Has strong background in food research and development. Occasionally conducts training and lectures. Lecturer of Cocoa Foundation of the Philippines. Do coaching and consultancy services on his free time.