dont glue them. they are imposible to clean (especially since you will be doing it hungover) and they tend to break easier when they are glued. Do what someone else said just cut inch and a half or 2 inch holes in the ski, (depending on the size of your glasses). the glasses will fit right in there and stay still until you dont want them too. Plus, if youre already pretty fucked up, you can take the glasses out of the ski to pour them.
From experience, this is the best.