If you're worried about calories, then stick with clear liquor. But as far as the effects of alcohol have on all the things 4th just mentioned, it doesn't matter where it comes from...the body does not know the difference.
Is it going to kill you to have a drink or 2? No, but you will feel it when you go back to the gym.
Also, saying I'm going to drink and there is no other option...can you at least admit that saying something like this makes you sound a little bit stupid?