We drink a little bit, saki and whiskey tend to be the two recuring drinks. Its fairly causal, like what you'd do when shooting the breeze. When I GM try somehow figure out senarios where my players/characters have to drink grog.
The best drinking situation we ever had was during the New World Game I ran. The players were the colonial ambassadors at this big summer native festival, Dark Ravens, Grey Fangs, Grippili, Foundamentalist Bahamut worshipping Kobolds, Druid Minators..the works. At anyrate the Bard and the warlock had to tell stories of 'great heroes' from the old world to impress the locals..ie they had re-tell an adventure of a character they played in a previous game. It was a skill challange so they had to do all sorts of checks but they also had to keep shooting saki until they were done. So they end up with like 8 shots apiece and then its time for the Warforge to do his bit. He sees me putting away the saki and is like "Where's mine?" and I turn to him and say "Warforges don't need food or drink "Mr I save so much money because I don't have to get an inn or eat.'" His face fell and the rest of us damn near busted a gut laughing.