Completed a batch of extract cream soda last week. tasted it for the first time today and it has a bad/alcohol-like taste to it. I followed the instructions on the extract bottle, which incidentally says to wait 48 to 72 hours for carbonation prior to refrigerating. After 24 hours, though, the PET bottles were hard - enough to make me believe that I reach maximum carbination. I decided to wait another 18 hours just in case (risking bottle rockets). I think this was a bad decision. I believe that the yeast had more time to consume the sugars, thus over-fermenting, creating alcohol.
My question: Can I pull the bottles from the 'fridge and add more sugar? Knowing the yeast has gone dormant, I am not sure this will work. Should I leave the bottles out to reach room temperature, then add sugar, wait a couple of days, and then re-fridgerate?
Or, should I toss the batch and start again?
My next batch will actually be a black cherry/vanilla soda:
100% black cherry juice from concentrate (local health food store)
Thanks in advance for any help and suggestions.