I had a cool science teacher who would happily advise us on the best ways to extract and distill alcohol from cheap drinks.
We were about 13-14 at the time, and this was Cornwall, one of the most backwards countryside areas of the UK 🙂
I think his easiest suggestion (he had many) was to buy cheap cooking wine (hence safe for human consumption), freeze it in open trays in the freezer, and remove the frozen water, leaving the alcohol behind.
Come to think of it, the alcohol would probably evaporate from the open trays, leaving behind non-alcoholic gunk. Better would be to use part-filled sealed plastic boxes. I'm sure he left out that detail for us to work out ourselves 🙂