I abstain on school nights since I teach the kids. The one drink I would usually have doesn't affect me at all in the morning, I just feel that abstinance puts me into the "work" zone, not the weekend zone. So when the weekend comes, I really enjoy those few drinks I allow myself. AND we don't pay for alcohol out of the regular budget. It's an extra so we have to use our personal fun money allowance to buy it and the ingredients for homebrew so that's additional motivation to just have a couple a week.
I did have a drink every single night on our three week winter break, mostly organic egg nog with spiced rum at $1 a pop, and even though it was completely awesome, I'm glad that won't be an expense now that school is back in session.