Kill the chickens and, judging by the vodka he's been drinking, the drunk is probably flammable so I'd light him on fire (using friction, of course) and cook the chicken, then drag him over to the wall and throw the remainder of the open bottle of vodka at him, which would then explode and I would be freed. I'd also ration and drink the still unopened bottle of beer that he left behind, slowly voyaging northward to civilization. And why the fuck is there a men's room in the middle of nowhere?