Hi Wingnut
I always understood that the stuff you make in a couple of weeks wasn't alcoholic, but I could be wrong. I make home made wine, and when you take more time and use proper wine yeast, it can be quite strong, and is really nice. when we moved in to our house with my father in law there were some bottles of elderflower that my mother in law had made years before, which had naturally gone sparkling - delicious! It is possible to do it deliberatley, but is dodgy and you need proper chapagne bottles.