Here what I do.... Math geek warning (with a little bit of OCD and ED mixed in for good measure)...

Take the BAC calc., I can have 2 (shots) until I'm legally to drunk to drive. So I take 2 to begin with. Then around every hour I take another 1 shot. So legally I'm drunk for the whole time. I have to wait until 2.5 hours after my last drink to be okay to drive. I don't drive. Between and after I try to drink 8-12 oz of pedialyte/gatorade until the next morning. I do NOT take my medication that night.