Story time:
My mom usually gets a gallon jug of the classic lemon for my family. We don't keep it refrigerated, since it doesn't go bad. WELL, I poured a glass for myself today, and it tasted odd. I couldn't put my thumb on what exactly it tasted like. I let my dad try it and immediately he said, "wine". When he said it, a lightbulb went above my head, it did in fact taste like wine. Obviously I don't drink a lot of wine, only sips from my parents glasses every so often, but my dad recognized it right away. Sure enough, some bacteria must have gotten into it and made it ferment. So yea, all the sugars were starting to become alcohol. Arizona iced wine with lemon.