Campus Outreach

I've recently started going to Campus Outreach with my boyfriend upon his request. It's a bit different for me since the people that lead the weekly event are obviously protestant (not that I am opposed) and I am Catholic. I enjoy how nice everyone there is though. For the most part, they seem to be very accepting of all that come in with spiritual views that differ from theirs. I'm still not quite sure how I feel about it though. The religion thing has always been a very touchy topic for me. I'm not quite sure what I do believe but I know what what it is that I don't believe. At campus outreach they firmly stick to abstaining from sex before marriage and living a life free of alcohol. I know that "thou shalt not commit adultery" is pretty straight forward, but no alcohol? Where in the Bible is there anything about alcohol being a sin.Of course drinking to get drunk is obviously a sin just as is doing anything in excess, however I do not believe that have a beer or a few glasses of wine is morally wrong. I'm not sure where I stand on this nor am I sure what I will teach my children about the fact. It's just something to think about I suppose.