If I'm going to be out for a long time then I will tip $1 for mixed drinks and $0.50 for a beer (I don't drink beer but I grab them for friends when I go up). If I'm not going to be out long I tip $1 for everything.

Oh and for shots I will tip about $1 for every different shot or $0.50 for a single. If I order like 10 shots of something the bartender only has to make up one batch and pour it into the shots so I will tip like it's one drink.