Pop: it's a sound and frankly a ridiculous name for anything, let alone a common object like a drink
Fizzy: see 'Pop'
Soft Drink: too long
So coke is the only feasible way to say it. Y'all are pretty silly
Soda.
So if coke is the term for many places then what about the actual drug?
Cocaine, of course. Coke in informal slang I'd guess. But usually there's no chance to mix up the two down here.