back to the beta blockers ... this could realy work if you have a problem with anxiety. I took them for a while and they really helped. of course, don't take it w/o talking to a doctor, and probably do a dry run with them before the actual interview. code blue on interview day makes for a hell of thank you note to write.
as for the whole "if you can't handle the anxiety, there's something wrong with you" schtick, check the DSM-IV. There a plenty of different kinds of anxiety and panic disorders. When I am a physician, I will probably have issues with anxiety. I've practiced a lot with visualization and breathing, but sometimes a pill is all that helps. I will probably not be a surgeon. I probably will take the occasional Klonopin during my work day. Will I be stoned? No. Will I be a danger to my patients? No. I will be calm and I will practice better medicine for it.
As for the two beers, probably not a good idea. The bathroom problem would be an issue for me. And the whole campus tour thing. They drag you all over heck before you ever see an interviewer. Buzzkill.