Yes, you put a glass and a 1 liter bottle of mixer under your pillow and the next morning . . . 
Actually, most of the dry counties have “unofficial” suppliers who pay a large but also unofficial tax (in small, unmarked bills) to the local law-enforcement guys who then turn a blind eye. The suppliers have strict rules about who they’ll sell alcohol. Any person buying beer must have cash money and be able to reach over the counter. Age is pretty much not applicable.
It really is a problem and it’s caused by the bible-thumpers around there. A politician campaigning to repeal the alcohol prohibition will be characterized by his opponent as a sot, and by the bible-thumpers as the next thing to the antichrist. The local law enforcement also has a vested interest in keeping things as they are.
A funny side-effect is the liquor stores placed about 6 inches over the county line. I know of one where you drive through a hellish swamp, no lights, two lane road and heavy forest all around. Black as hell at night. When you come around the last curve there are about a dozen liquor stores in a neat clump. Huge displays and billboards etc. It looks like a tiny piece of Las-Vegas got lost.
Regards
Testy