When I was younger, I referred to it generally as Coke. With Houston, becoming such a melting pot though, over the years I've gotten in the habit of saying the specific brand name, when ordering at restaurants.
I still use Coke with family though, if I'm speaking in general terms, such as requesting somebody bring "Cokes" to the party. Meaning an assortment of drinks, not just Cokes. With people I'm not as familar with, I use either soft drinks or soda water. I don't think I've ever called it pop.
Par...