The beverage has been around for more than 2,000 years; in fact, the ancient Chinese called Kombucha the "Immortal Health Elixir." Kombucha is a colony of bacteria and yeast, which is then added to sugar and tea and allowed to ferment in order to produce what is known as Kombucha tea.

The tea is available commercially and can also be made at home

Source: http://www.collegenews.com/article/kombucha_tea_magical_elixir