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To make root beer, start by mixing 4 quarts of cold water, 2 cups of sugar, and 3 tablespoons of root beer extract in a large pitcher. Then, taste the mixture to see if it's sweet enough. If it's not, add 1 more cup of sugar. Next, drop some dry ice into the pitcher to chill it and make it bubble. Make sure you're in a well-ventilated area so you're not inhaling the dry ice fog. Finally, stir the mixture for 10-15 minutes or until all of the ice in the pitcher has fully melted. To learn how to brew your own root beer, keep reading!