Bring filtered water up to a boil in stock pot. 

Take off the heat, then add the sugar and tea. 

Allow cooling completely then transfer sweet tea to a gallon-sized glass jar. 

Add in the kombucha scoby and 1/2 cup kombucha liquid from a previous batch.

Cover the jar with a clean dishtowel and allow to sit at room temperature, undisturbed, for a minimum of 9 days.

After this fermentation time, remove the scoby and 1/2 cup of liquid from the jar and reserve for the next batch of kombucha. 

Bottle the remaining liquid and either store in the refrigerator, or at this point add in your flavorings (such as pureed fruit, vanilla extract, chia seeds, lemon juice, ginger slices, whole berries--whatever you like!), cap the bottles and let the flavored bottled kombucha sit out on the counter for a few more days to get extra fizzy. Will keep indefinitely!