Root Beer of course! And no fancy forced carbonation equipment is needed. But first, an explanation of sorts is needed on the ingredient list.
I have come to find that Sassafras is illegal to sell in the United States. The main ingredient in Sassafras oil is Safrole - a chemical that has been determined to be mildly carcinogenic by the Food and Drug Administration. Bugger.
Safrole can be removed from Sassafras root oils - but it requires specialized equipment and stringent processing. Not something the average home soda maker can do. The alternative is, processed concentrate :P
Yes, by entering this - I am saying you could win my heart with a bottle of root beer (or even better, home made ginger ale).
Step 1: Ingredients and Materials
1 Cup Cane Sugar
1/4 teaspoon Yeast
1 tablespoon Root Beer Concentrate
Fill your bottle half way and then add about a quarter cup of chlorine bleach. Then fill the bottle with water to the top. Cap and allow to rest on its side for about fifteen minutes. Afterwards, rinse well.