1/8 tsp yeast
2 1/4 cups sugar
1 1/3 tbsp soda flavor extract
1 gallon jug/container
2 2-liter soda bottles
1. Heat 1 cup water to between 98-110°F.
2. Dissolve yeast in water. Make sure yeast is completely dissolved.
3. Mix dissolved yeast, 2 1/4 cups sugar, and 1 1/3 tbsp soda flavor in gallon jug/container. Add enough water to fill jug/container.
4. Shake to mix for 2 minutes (until sugar is completely dissolved).
5. Pour half of mixture into each 2-liter soda bottle.
6. Cap tightly and let sit for 4-6 days, checking a few times a day on carbonation.
Soda flavorings can be bought in many supermarkets. Some of the flavors sold are Root Beer, Ginger Ale, Cola, Cream Soda, Orange, Grape, and Dr. Pepper.
In step 2, you must use the right amount of yeast. Too little will not carbonate the soda and too much might burst the bottle.
In step 2, the temperature of the water must be correct or it will nullify the effects of the yeast.
When checking to carbonation in step 6, just squeeze the bottle. If it feels too tight, let out some carbonation by unscrewing the cap and letting off a little.
As this is a recipe for soda, it's not particularly healthy and very high in chemical content. But it can't be any worse that store bought soda, so if you're ok with that you should be ok with this too.