It's "pop" around here in Minnesota, and in South Dakota where my parents live. My first job out of college was in downstate Illinois, not far from St. Louis. Everyone said "soda." But 100 miles north, it was "pop." Once I ordered a hot fudge sundae, pronouncing sundae like "Sunday." I was corrected by the waitress. They say SUN-duh. "Missouri" is muh-ZER-uh. Basically, any word that ends with a vowel gets the schwa sound.
In parts of Wisconsin, the drinking fountain is the "bubbler."
/CSB
In parts of Wisconsin, the drinking fountain is the "bubbler."
/CSB