it all depends bro, what's your current cycle going to consist of?
Personally dependiing on your cycle and when you end up running PCT why bother bringing anything to Mexico when you can pick up whatever you need while you're there and not have to worry about taking anything across the border either way depending on where you're going of course.
As for drinking, if this is a lifestyle for you and you've dedicated countless hours in the gym getting your body to look great why risk your health and all of the hard work on a few nights of reckless drinking? The girls will still get drunk and hook up with you wether you're drunk or not. A few drinks here and there won't really hurt you but try and eat clean while you're there if possible. Bring some ALA with you and LIV-52 and take them everyday.