Happy hydration hour
SJ (who isn't living up to the URL given the excellent hack) keeps the kid in fluids:
Happy hydration hour: I used to worry excessively about hydration with my oldest when she was throwing up or otherwise ill, and I hesitated to give her Pedialyte unless she was in really bad shape, so I used to give her water in martini or highball glasses. This only works if they are calm, non-throwers, and they need supervision if you're using real glass. I was more flexible with things like plastic margarita glasses. My daughter loved the novelty of drinking out of the normally-taboo funny-shaped grownup glasses and would finish the whole thing. And the pictures! It almost makes up for the puking.
Here's a recipe for homemade Pedialyte-type re-hydration solution, if you're interested.