Airlock: vodka, water, or
I've just started making my first brew, and am using vodka in the airlock, but am hoping for some more detailed info about what is best practice, or if there is not really any difference between using water, vodka, or other things I haven't thought or heard of...
Also, does the quality of the vodka count? (As in, cheap vodka has a, er, particular taste - if that ends up in the fermenter, how much will it affect the brew taste?)