When made with clean supplies and when ingredients are submerged in the liquid while fermenting, tepache is safe to drink. The sugar in the liquid prevents bacterial growth until the yeast acidifies the drink, then the low pH takes over as an antibacterial protection. If you notice any mold growing, or detect any off-flavors or smells, throw away the whole batch and u003ca href=u0022https://brewbuch.com/clean-kombucha-supplies/u0022u003eclean your suppliesu003c/au003e well before trying again.