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

Be yourself, if you like her otherwise, show up, and have a beer, then switch to water, or whatever. Or Leave the bar and grab a bite... Just see how it goes, it could be "grabbing drinks" just cause she didn't know what else to say to get together. She may be just like you... or she may be a drinker... But you wont know if you don't show up. Good Luck!

JOE