Girl wants to meet for drinks but... I don't really drink WHAT SHOULD I DO?

Dude let me get this straight. You have read enough into (lets meet for a drink) to have issues with it??? O/K one of two things is going on here. Either you already don't like her, or you are way too uptight for dating. Don't look so deeply into things. Do you even know what she looks like? Just go and check her out. If you like what you see ask her out again. If you don't just use this for practice, loosened her up a little and try to hit it. If she doesn't go for it you didn't loose anything. If she does you might not be so uptight after.