If you want to avoid the lines and chaos, go into Hogshead Tavern(the bar). Entrance is in the back, just go down the small alley way beside it(where the ATM machine is), you'll find a nice relaxing patio with great views back there as well. I've never had more than a 2-3 minute wait at the bar. They sell frozen and regular butterbeer, as well a specialty beer called the Hogshead Brew and a couple other beer choices on tap. They may have other adult drinks as well, Im not sure as I didnt ask. All I know is standard Potter rules apply there as everywhere in the land AKA no Coke products. My cousin was dying for a Sprite and the bar keeper never broke character as he looked at her like she were nuts and replied, "You muggles are weird creatures. You drink sprites? Doesn't that upset their kinfolk? How do you catch them anyway?" It was hysterical.