Insein
Footballguy
I ask places if they have Pepsi and if they say no, I'll take a sprite.I think that is more recognizing Coke is a brand and asking you if a different brand is OK.Nothing bigger than Coke. I still ask for a Coke at a pizza shop and sometimes they say, " is Pepsi ok?"
I've heard "what kind?" afterward, as in:
"I'll have a Coke."
"What kind?"
"Sprite."
...that's truly making "coke"="soda"