The tangy drink known as kombucha is no longer an obscure potion: it has officially gone mainstream, and it’s one of the biggest trends in healthy living and the culinary arts. Learn everything you need to know to make kombucha, vinegar and vinegar-based drinks like shrub and switchel at home—from scratch. In fact, you’ll start your very own batches of kombucha and vinegar to take home and ferment. Materials: $20