Recipe- Make you own Soda!

I know that it is way cooler, and even more delicious(if you get it right) to make your own goodies.  Well, here's a goodie that MANY people consume on a daily basis, but is also something that you can create in your own home!

Ingredients
1/8 tbsp yeast (champagne yeast from a brew or wine shop or regular Red Star or Fleischmann’s yeast)
Coffee cup of warm water (98-110 degrees)
2 1/4 cups sugar
1 tbsp+1tsp soda flavor extract
A little less than 1 gallon of water 
1 gallon jug
2 2 liter bottles

Dissolve 1/8 teaspoon of yeast in a coffee cup of warm water for about 5 minutes. Yeast should be fresh. Too little yeast will not yield enough carbonation, too much will give the soda a "yeasty" taste and might burst your soda bottles. Water too hot or too cold will have the same effect as not enough yeast because in cold water it will stay dormant and in too hot water it will be killed off.
Then mix 2 ¼ cups of white sugar, 1 tablespoon + 1 teaspoon of flavoring extract, the dissolved yeast and enough extra water to make 1 gallon together in the gallon jug. Shake to mix for about 2 minutes until the sugar is completely dissolved in the water. Pour ½ the mix into each of the two 2 liter bottles, cap tightly and wait 4-6 days. You can tell how your carbonation is coming along by just squeezing the bottles. If they get too firm open the cap and let off a little of the carbonation.