While at a friend’s birthday party, some one got some Angostura bitters, which was used as a flavor additive for whiskey. He was having people give it a sniff. I being a super taster, I immediately recognized the smell as the same ingredient in Pepsi that I’ve been trying to find! After me telling the rest of the party this, they agreed. We put some in glasses of coke, and PRESTO! Pepsi! But with a very bitter after taste. Now Angostura bitters is them self made from a secret recipe. But it’s a place to start.
Also I was sent a link on the dangers of Caffeine. Check it out.