The pina colava was on the menu at most places we went in January, but I didn't have one because it was too cold outside - didn't want a frozen drink!
But what I've been told (by a Disney bartender) was that you can pretty much get any WDW drink at any WDW bar...some bars "highlight" certain drinks over others, and they may serve the drinks in different shapes/size containers, but the basic concoctions are the same. Don't think you can get the Polynesians' lapu-lapu everywhere(the one served in a pineapple)...might be able to get the drink, but not in a pineapple.