The big Texas cities are all full of transplants, so slang is all over the place. It's usually in the small and mid-sized cities that I've heard the "Hey, do you want a coke?" thing. When I'm in Dallas/Houston/Austin, it's "what do you want to drink?"
I personally switch between coke and soda (military brat). I think I only said "pop" when I lived in Indiana and visited family in Michigan.
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