What is the chemical formula of coke for a chemical reaction with water?

That is a trade secret. Not even those who work at the bottling plants know what this is ... it is only known to two people, and I doubt that either of them will reveal this to anyone.

However, the very basic ingredients that make up a cola are cinnamon and vanilla. Some may even include hints of citrus (such as Pepsi) or clove (Coca-Cola).

dude check the site http://www.snopes.com/cokelore/formula.asp

it has a formula in it