Soda in the US refers to "pop" in british english. Americans don't usually say "soda water" for carbonated water, in my experience.
A 1996 linguistics study inspired a map [...] showing “soda” prevalent on the coasts, while “pop” held sway in the Northwest and Midwest, and the generic “coke” took the South. There must be some electoral significance to this.
https://ideas.blogs.nytimes.com/2008/09/11/the-soda-vs-pop-m...
It might be regional, but I think "soft drink" or ""fizzy drink" are far more common. I can't recall the last time I heard "pop" used in this sense.
An entirely unscientific search on some sites (Deliveroo, Ocado etc.) shows "pop" either not returning any drinks (Deliveroo near me) or returning pretty much the same as "soda", with Ocado returning the "fizzy drinks" category for both searches.