Bruce Wayne drinks ginger ale at parties to help keep his body and mind in top shape. I don’t have a good source for this, in that there’s no single authoritative reference that I can link to.
Since I don’t have a single authoritative reference, let’s go with this: a comic about two dinosaurs, one of whom is going to give up drinking. I’m talking about a comic character anyways, right? Another comic is basically a primary source.
There’s also Wikipedia. Just go to the Batman page, and then search in the page for “ginger ale”.
This makes me happy, because I like Batman/Bruce Wayne, and I also like ginger ale. Generally when I’m at a bar, there’s whiskey and a slice of lime involved, but this isn’t a bad idea for ending the night if I have to drive.
Also, Batman used ginger ale as a replacement for champagne. Something worth remembering for NYE. Happy 2012, everyone!