Do I have to add the sugar? Yes, without the sugar the fermentation process doesn’t work. If you add less sugar this will starve the scoby. Related articles What type of sugar do I need to make kombucha? What type of tea do I need to make kombucha? What do i need to make kombucha? What if I add my scoby and starter culture before the tea has cooled properly? My kombucha tastes vinegary, what have I done wrong?