Nuka-Cola was the most popular soft drink in the world before the Great War. After the War, many bottles of this pre-War favorite still survived, and Nuka-Cola remains one of the most popular soft drinks of the post-apocalyptic world. Their bottle caps are also famously used as currency, along with Sunset Sarsaparilla.

http://fallout.wikia.com/wiki/Nuka-Cola

Pretty sure this mug will transmute anything I put into it into Nuka-Cola. Which is just fine with this wasteland wanderer.