The first batch got infected, but I have a better feeling it will work this time.
We obtained a mother (AKA: SCOBY, mushroom, starter) from someone and started it yesterday.
We picked out some plain tea - it was recommended we not use anything with oils or other flavors added.
Brewed 5 tea bags in half a gallon of water, plus 1/2 a cup of sugar. Let it cool.
Then added the mother and topped it with a coffee filter. Now we wait!
If you want flavored kombucha you add that after it's done fermenting and after you've removed the mother (and the baby).