Thirst
No you are not doing something wrong. I was a guzzler during meals preop. I could drink 3 large sodas out at a restaurant during a meal. Two things I do is to rinse my mouth after I eat with a little water (then you get rid of the taste from you meal) or brush my teeth. If I'm out I'll pop a mint just to "refresh" my taste buds and that usually does the trick.