Look on the internet and you will find lots of recipes for kombucha. Rachel, from Small Notebook, has the clearest directions for homemaking kombucha that I have found. It really is a lot of fun if you haven't tried it. Before I began making my own kombucha, I saved up my G.T.'s kombucha bottles. I use those to store my individual batches of kombucha. It would be fun to buy the home-brewing bottles that Rachel uses though. Maybe one day.
How to Make your Own Kombucha.