Additionally, I want to emphasize that it's important to not write off a non-drinking friend simply because they don't seem to be opening up in the way you want. I find at least some drinkers seem to write me off in all social situations based only on those that involve drinking. If that's not the way to get to know someone, try another way. Also, if it really is about opening up and not drinking, tell that to your non-drinking friend!