At Three Stone Hearth, flavors include the original black tea kombucha, hibiscus, lemon ginger, and grape. After you feel confident creating a standard brew, try fermenting different white and green teas. For different flavors, add two to three ounces of fresh squeezed juice to each bottle when pouring the brew into the bottles for the second fermentation.
In terms of serving size, Otto notes, "Kombucha is a concentrated food source of probiotics. We recommend starting with four ounces. See how your body responds to it. Different people have different reactions. Ultimately anything, even yogurt, can be harmful. It just depends on your system and what certain amount is functional for your system."