Kombucha
To make it, you add yeast and sugar to a tea mixture and let it ferment. This creates vinegar, B vitamins, and fizzy bubbles. The result is tangy, refreshing, and lower in sugar than many soft drinks. It may help keep you regular and boost your immune system, but researchers need further study to be sure. You can make it at home, but if you do it wrong, harmful bacteria could grow and make you sick.