Making kombucha at home is fairly easy.
Let tea cool to room temperature. Add liquid to 1 gallon container with a kombucha starter ("mushroom"). Cover with towel and leave jar someplace dark and in the kitchen or closet or anyplace quiet in the house. Let stew for 10 days. After 10 days, it's ready to jar and refrigerate, add your own fruit blends or juices.
Starters can be obtained by simply buying kombucha from the store. Pour some of the active kombucha into the gallon jar and it should take off on its own.
You can also order your own kombucha kit from Kombucha Kamp.
Following Weston A. Price