Which word do you typically use for carbonated soft drinks?

[Fritz]

"Pop" is a generic name for all types of soft drinks, as is "soda" or even "soda pop."  I generally use "pop".

"Coke" means cola, it doesn't have to be Coca-Cola.  When ordering, I generally ask for diet coke, to which I sometimes get the response, "is diet Pepsi okay?"  Yes, I don't care what brand of diet cola you bring me; asking for a diet coke does not specifically mean Diet Coca-Cola.  If I were going to specify a brand, I would ask for a Coke Zero (which most restaurants don't carry).