Brew 2 cups of black tea or green tea
Dissolve 2 to 4 tablespoons of sugar in the hot tea
Let the tea cool to room temperature
Pour the cooled tea into a clean glass jar
Add 1/2 cup of plain, unflavored store-bought kombucha with live cultures
Cover the jar with a breathable cloth or coffee filter
Secure the cover with a rubber band
Keep the jar in a warm, dark place
Leave it undisturbed for 1 to 4 weeks
Check for a new SCOBY layer forming on the surface
Use the SCOBY when it is thick enough for your needs