<p>Can’t tell you about all but S is in a 42 member fraternity with 5 members that don’t drink. Neither drinkers nor nondrinkers care what the others do. If one were strongly opposed to drinking, a fraternity/sorority might not be a good place to be but many have no problem if you choose not to drink.
Best advice would be to ask. If they pause or have much hesitation in their answer, drinking is probably a key part of their house. If they immediatly answer and point out several of their members who don’t drink, their organizations don’t revolve around drinking.</p>