Buy a bottle of RAW, unpasteurized 100% kombucha (no fruit juice added). You will also need – a glass bowl, caffeinated (green or black) tea, sugar, a small towel or wash cloth, a large rubber band, and a glass jar with a plastic lid.
In a large, clean glass bowl, place 2 tea bags and 1 tbsp of sugar. Add 2 cups boiling water and allow the tea to steep for 10 minutes.
Remove tea bags and stir to make sure sugar is dissolved. Allow to cool a bit, then add the entire bottle of store bought kombucha.
Cover with the towel and secure it with the rubber band. Place the bowl in a warm (70'-80' F) dry place (I put it on top of my fridge) and forget about it for 2 whole weeks. No peeking!
— 2 weeks later —.
Take the bowl down and uncover it. OMG, you totally grew a SCOBY! Store your SCOBY in the fridge, in a clean glass jar with a plastic lid and floating in the extra liquid. Brew kombucha according to these directions. ***Always handle the SCOBY with very clean hands!