Heat 1/2 cup of the the water to 205º-210ºF

Steep the tea for 4-5 minutes

Remove the tea bags, pour in the sugar, and stir until completely dissolved

Pour in the (room-temperature) 1/2 cup of water to cool the liquid quickly

Wait until completely cooled, and finally add the bottle of store-bought kombucha

Securely cover with a clean and breathable material, such as a coffee filter or cheesecloth

Place in a warm (70º-80ºF), dark spot for about a week until the SCOBY starts to form

It's will start looking like bubbles, then a translucent film, slowly growing into a white-ish disk.

SCOBYs look weird! It might be slightly discolored, bubbly, warped, etc. What you don't want is fuzz

Anything fuzzy or mold-like, toss the batch, sanitize, and try again. If you use enough starter and maintain a clean, warm environment, this shouldn't be a problem

Once the SCOBY has reached 1/4-1/2 inch thick, she is ready!
<img src="https://servingrealness.com/wp-content/uploads/2016/05/Growing-a-SCOBY-e1463296511730.png" alt="growing kombucha at home" height="1397" width="783">