Water isn't a magic lubricant. Pills still get stuck in my epiglottis with water. Usually when I take pills, I do it followed by a piece of bread and then water, but prior to bed I don't want to eat anything after brushing my teeth and the pill dissolves nicely, and like I said, I assume it's safe, because chewables exist (obviously other drugs don't work in a similar manner).
Ah. Have you tried butter, which would be a lubricant? And it would probably be relatively safe after brushing because of the lack of sugars.
Butter is delicious, but sadly it too lacks any fel or fey essence necessary for magicks.