I've made excellent root beer with root beer extract, sugar and water, mixed hot in a 5-gallon soda keg, then chilled and carbonated by putting a fair amount of CO2 pressure on the keg and shaking the bejesus out of it.
Many homebrew shops sell root beer extract (and usually more than one kind, like root beer, sasparilla and birch beer). The recipes provided (basically the proportions of extract to sugar to water) are dead simple, too.
Good luck!
Tim



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