With clean hands, place SCOBY and starter in the 2 ½ gallon crock.
In a separate jar (a gallon jar works nicely), dissolve the sugar in about ½ gallon of boiling water. Stir until sugar is completely dissolved.
Add tea bags. Brew for 10-15 minutes.
Add remaining water to make a full gallon, and remove tea bags.
Make sure the tea is cooled enough to the touch, and add to the crock. (If your tea is too hot, you can kill your SCOBY.)
The first batch of kombucha will be completely ready within 5-7 days. If you are weaning off sweetened drinks and a first-time kombucha drinker, you can start drinking a couple of days earlier for a sweeter/milder kombucha.
Feed your kombucha (or repeat the process of making a gallon of cooled sweet tea) about once per week.