Soda, pop, and coke

[Sam Spade]

I was born in a "coke" mainstay, ie Harris County, and therefore have always referred to it as such.  If you want something else, you refer to it by name, as Alcon states, though that rarely happens.

"Soda" or "soft drink" is also an acceptable alternative, though rarely used.  Obviously, since I moved to Maryland, most people say "soda" or "soft drink".

"Pop" will get you laughed at or mocked at by fellow companions, as well it should be because it's rather silly and stupid.