After ordering a mother with which to begin several months ago, we have had a constant supply. We start by brewing a mix of black and green teas (4 bags total) in 4 quarts of water on the stove. Once boiling we add the teas bags, let brew for 20 minutes then remove bags, add 1 cup of sugar and then leave to cool (for what seems like forever) to under 90 degrees (anything hotter will kill cultures). Add your mother, cover jar with a clean cloth, and set in a warm-ish, dark place for 14-20 days. This amount of time will depend on your environment - in a warmer climate things will grow more quickly.
Once a new mother has grown on the surface (it will be very evident) remove with clean hands & 1 cup of your fermented batch to reserve for the next round. At this point you can choose to leave as is, or add additional flavorings. We love a strawberry & ginger combo or guava, blueberry or raspberry. Really, we haven't made one we did not like. We also sprinkle a touch (1/4 tsp) of sugar into each jar to enhance the natural carbonation. It's a delicious & refreshing fermented jar of goodness. Once you've flavored your jar, place back in the pantry for about 7 days. We accidently left our last flavored batch resting a bit too long, and it's walking a fine line between beverage and vinegar. 