What is the popular beer that is sold at Hogsmeade in Harry Potter?

Butterbeer was a popular wizarding beverage described as tasting "a little bit like less-sickly butterscotch." It was served at numerous locations in the wizarding world and had a very slight alcoholic content. Students of Hogwarts School of Witchcraft and Wizardry would often buy it when visiting Hogsmeade.

Butterbeer was served cold in bottles and hot in "foaming tankards". In Hogsmeade. It's sold at The Three Broomsticks and The Hog's Head, although the fact that the latter pub's stock was described as "very dusty" suggested that it was not sold there very often. In Diagon Alley, the drink had been known to be sold at the Leaky Cauldron. It was made out of butter, sugar and water.

Butterbeer is served foaming hot in mugs and cold in a bottle and bottle of Butterbeer in the Hog's Head costs 2 Sickles each.

House-elves could get drunk off Butterbeer, as Winky often did. During Harry Potter's fourth year at Hogwarts School of Witchcraft and Wizardry, Winky was often found drunk within the kitchens after she was sacked by Barty Crouch Snr For a house-elf the drink was much stronger and Dobby would take her to the Room of Requirement to find antidotes there. It was considered shameful for an elf to consume such large quantities of Butterbeer.