Best mix with captain morgan spiced rum?

Coke for sure.....I used to drink it with cherry coke zero

Doesn't matter- anything to hide the taste of that gut-rot rum.

Aside from the obvious choices of 7up or Sprite, 
this is one of the only times that I am going to say Pepsi. 
It takes the edge off of CMSR better than almost anything else.

Crushed Ice - needs nothing more.

i hate sodas.....

Coke, or cherry coke.

Try orange juice. It's good with regular rum. Worth a try.