I don't drink, but I see the conundrum. Remembering that you are not on your own premises, which changes the context... do you go undefended because you figure you'll have a few beers, or do you go defended, thinking that you'll only have a few beers?
In truth, that question can be answered only by you. I have friends that I wouldn't trust with a slingshot when they're sober, let alone drinking... and a very few that I would (be more prone to) trust with a hand grenade if they were totally sloshed.
From a legal perspective, Nocturnus has it exactly right.
Cheers,
C