Quitter and
Koala, congratulations on 2 months!!!!!! Absolutely massive, i'm not far behind you
Enfin - sounds like you need a watertight plan to get through that. If it was me, I'd be telling them straight away that i'm not drinking, the reason doesn't matter. Get it over and done with so that you're not leaving the door open for any drinking whilst on the trip. You aren't letting anybody down, you're doing this for you.