I make homemade rootbeer twice a year. At family reunion time and in a bubbling cauldron for Halloween.
6 cups white sugar
3 1/3 gallons cold water
1 (2 ounce) bottle root beer extract
4 pounds dry ice
In a large cooler, mix the sugar and water. Stir to dissolve. Stir in extract. Carefully add dry ice. Let brew for an hour.