Butterbeer is a genuine medieval alcoholic drink dating back to at least 1588 that is still popular in the wizarding world. A non-alcoholic version was created by chef Steven Jayson for The Wizarding World of Harry Potter theme park.
 Appearances in the Books
 Additional Canon
Harry Potter author J.K. Rowling has said that she imagined Butterbeer to taste like "a little bit like less sickly butterscotch."
The version of Butterbeer at The Wizarding World of Harry Potter comes in two kinds, regular and frozen. The regular is said to taste like cream soda. The frozen is a slush version of the regular. The version of Butterbeer at The Wizarding World of Harry Potter was sent to J.K. Rowling who approved the drink.
Although the Universal Orlando has refused to release it's official recipe for Butterbeer, many fans have created there own versions of the drink and put the recipes online. Most of these recipes involve club soda or cream soda. Some are very simple involving only two or three ingredients and a few very simple steps where as some require more preparation.
At The Wizarding World of Harry Potter theme park, Butterbeer comes in either a plastic cup for the price of three dollars for a regular and four dollars for a frozen Butterbeer. It is also possible to get it in a hard plastic souvenir mug for the price of ten dollars for a regular and eleven dollars for a frozen.
Butterbeer can be bought either at the Hogs Head pub or at the Butterbeer cart in the middle of Hogsmead square.