My very first batch of kombucha is about done with its first fermentation. The person who gave me my SCOBYs didn't have enough kombucha to give me for my first batch. I had to buy a bottle of kombucha and got strawberry because they didn't have any plain. Now I'm scared I've ruined it. I heard that strawberry rots easily if using it in the second fermentation. How will I know if it's bad?