Cola Soda Extract
Old fashioned homebrew sodas. Makes four gallons of cola soda. Just add water, sugar, and yeast.
This four gallon recipe requires 5# of sugar, you can find that here
You can use 8oz Malto Dextrin to add body to your soda, you can find that here
For extra flavor, you can add 1# of honey to your soda, you can find that here