1. I'm on Remicade as well as I saw you are with your intro thread. I can drink no problem although I don't do it to to often. I did go to Mexico all inclusive a week after starting Remicade and well with free drinks from when you wake up to when you finally go to bed I had a little bit of alcohol and no problems at all.
2. Never taken workout supplements but I'd advise little tests if you really feel the need to. Just take it one day and then wait a day or 2 and see if anything happens. If not then your probably safe to continue with it.
Both of these questions are probably better to be asked in the Diet and Fitness section.