I seem to have found the secret formula
. Here is an excerpt
In 1993, Mark Pendergrast published what he believed to be Coke's original formula in For God, Country and Coca-Cola. He'd come across the following among John Pemberton's papers:
Mix Caffeine Acid and Lime Juice in 1 Qt Boiling water add vanilla and flavoring when cool.
let stand 24 hours.
So there you have it. Oh, and mind you this is purported to be the original
recipe, not the stuff you're drinking now.