Homemade Root Beer - http://allrecipes.com/recipe/homemade-root-beer/ But we've been making this for years and make a little different version. Ours is to stir 5 lbs of sugar into 5 gallons of water. Add a 2 oz bottle of McCormick's Root Beer extract and add 5+ lbs of dry ice. This makes about 5 gallons and was gone 1.5 hours into the party. @.@ Next big bash we'll need to make several batches.