Years ago, I purchased a kit called " Spike Your Juice " from ThinkGeek.com . The kit included packets of yeast, instructions, labels, and an airlock with stopper. The instructions suggested buying a pasteurized (non-refrigerated) 100% juice with a high sugar content, then pitching the dry yeast into it and popping on the airlock. In a few days, the yeast would produce an alcoholic wine or cider. The results from these fermentations always seemed to range from sour to dry in flavor profile, often tasting like an unripe version of the fruit the juice was made from. It's not too surprising that I stopped using the kit before I used up all the yeast. While reading online about that kit, I saw some people suggest that Champagne Yeast would be a good substitute for the stuff the kit included, as it would ferment more of the sugars and give the finished product a bit more fizz. I tried this with some juices a couple of months ago. The results were tart and mildly carb