Puree blueberries and peach using an immersion blender, food processor, or stick blender. Optionally, strain the puree through a sieve to leave skins behind. Add to jar or bottle.
Add ginger slices and basil leaves to jar.
Top off with Kombucha.
Secure lid tightly and wait 3 days.
Enjoy! Refrigerate unused portion.
Recipe by Fermenters Club at https://fermentersclub.com/summer-kombucha/