I love the frozen margarita stand in the Mexican pavillion in Epcot. Anywhere in the World Showcase really. There's an Irish pub where you can get a huge beer or cider in a tall plastic glass thingy.
The Mexico pavillion has the 2nd best margarita I've ever had -- and that's only because the 1st best came from a place owned by a guy who made his living singing about 'em!
Depends on the type of drink. Lots of great places in Epcot I like
Rose & Crown for beer. Tropical drinks - Poly, Margaritas Mexico,
German good beer also. I could go on.