Replying to Masking alcohol on breath

Basically what title of the thread says.

My buddies and I are going to an under-21 club saturday night. My one friend is driving, and the other 2 guys and myself are planning on doing shots in the parking lot before we go in. Not a big deal because it normally takes about 20 minutes for vodka to fully hit you. I just want to make sure we don't reek like booze when we go up to get in. I mean I know a bunch of people go in wasted all the time, I'm just trying to take extra precautions.