Generally, black tea is the best tea for kombucha fermentation. Our Kombucha Kit uses 6 tsp caffeinated loose-leaf black tea. We offer tea & sugar refills, but you can certainly use bagged black tea (6 bags).
Kombucha needs caffeinated tea (black, green, oolong, etc.) because it provides tannins & nutrients for fermentation. Black tea contains the most tannins, which is why it’s our preferred tea for kombucha. Without tannins & caffeine, your SCOBY can grow weak and eventually die.
You can use a combination of black & green tea if you’d like. But black tea is recommended for your first few batches - it helps build a strong starter tea & healthy SCOBY.
You should not use herbal teas (peppermint, chamomile, dandelion, etc.) because these don’t contain any actual tea - “cameillia sinensis” - or caffeine. Herbal teas can also contain unwanted oils that can weaken the SCOBY and lead to mold growth.
You should avoid using any flavored teas (Earl Grey, Masala chai, etc.) because the flavors, spices or fruit in these teas can harm the SCOBY. Flavors, spices, fruit, juice, herbs, etc. should never come in contact with the SCOBY & should only ever be added to bottles.