There are many variations on the standard Rum 'n' Coke cocktail. Mixy's Rum and Coke drink recipe adds amaretto to bring out the almond-cherry flavor of the cola. You can make it with regular or diet cola.
Vintage bottle caps from pinner Will. I'll have to post my photo of why this is in this board -- a vintage cap I randomly saw last spring in the middle of nowhere outback driving out from Woomera, Australia.