One of the first acts that Mikhail Gorbachev did when he took over leadership of the Soviet Union was to try and reduce alcohol consumption by limiting vodka sales. As soon as he did that, the stores emptied of sugar and all the other ingredients for making moonshine.
I have no doubt today's teenagers are just as resourceful.
Regards, Ivan
All you need are a 2L bottle of apple juice or cider, a half teaspoon of brewer's or vitner's yeast and a ferment lock. Drain off maybe the top tenth of the juice, cut a small hole in the center of the cap, push the ferment lock through, put it back on, and leave it alone for a couple of weeks. It will probably taste like crap, but it will be booze. I'm sure every teenager who really wants to know already does.