what beverage would you mix with coke?

Hello k:

I've always liked Dom Perignon with coke..

excon

Cherry juice

Malibu. :)

Mad amounts of alcohol. 

I don't do drugs.

As they said in the movie "Guys and Dolls", I like to add a preservative called Bacardi...;-D...

Ice cream

#black cow

Water in a frozen state.

If we're talking CocaCola then any of the following are good:

Chocolate syrup
Vanilla syrup
Cherry syrup
Lemonade (called Spezi by our German friends)

But my favorite is a product from Fred L. Myers's & Son.

Black Velvet whisky.