Thats really cool! I always figured kombucha was just a pretentious drink for people who shop at Whole Foods.
It looks "hip" to walk around with a bottle of weird looking stuff that costs $5, especially if you have the right fashion down.
Seriously tho, homemade kombucha is the shit if it's done right, and at a fraction of the price of the bottled stuff. It's actually a really heathly drink in the sense it's better than juice or soda, and is good for the gut and thus the immune system.