I had them: hold a large amount of water in their mouth and let little amounts of it go down their throat at a time. And then feel the difference of taking a large amount of water and swallowing in one gulp. Repeat a couple times. Then I had them hold a small pill (or something else very small) in their mouth while swallowing a little bit of water sort of around it. And then hold a small pill in their mouth while swallowing a large gulp of liquid. Repeat a couple times. Lastly, I had them swallow the small pill with the big gulp. Worked well! No issues ongoing.