Say what you want, but I can easily get drunk/buzzed/tipsy off a single shot.. so it's not impossible.
And a pint and a half is my limit. Unlike RL I find it easy to stop drinking. But you don't know that about yourself yet.
I say when it comes to the rents.. better safe than sorry.. but then again I'm a goody-two-shoes type of girl. In the end, ultimately the decision is yours. If I were in your situation, though, I wouldn't drink, but that's just me.