Most Helpful Girl
Is it that you want a girl who doesn't drink or a girl who doesn't go to bars? I live with four other girls; of us five, one of us is allergic to alcohol, one doesn't drink by choice (can't get over the taste), one doesn't drink because a lot of her family are alcoholics, and the other two drink socially. All of us, however, hang out at bars. That's just where we go to meet up with friends, go dancing, and meet new people.
Finding a girl who doesn't drink is doable. Finding a girl who doesn't go to bars might be a lot harder.