Jell-O water is something I keep recommending to people for sore throats and upset tummies, and I get a lot of "What in the world are you talking about??". I thought it was a common home remedy, but apparently I was mistaken. So, rather than regularly expounding on its marvelous palliative properties in the catbox, I'll node it here so all may rejoice in the goodness that is Jell-O water.
To make Jell-O water, take a normal 3 oz packet of Jell-O (I recommend any of the red flavors, but they have the drawback that if you vomit, the medical provider of your choice will be unable to tell if there is any blood in your vomitus...). To make regular Jell-O, you're supposed to add one cup of boiling water and one cup of cold water. For Jell-O water, take three to four cups of boiling water instead, stir the powder til it's dissolved, then let it cool enough to drink.
Drink it as hot as you can tolerate. The sugar gives you some energy and relieves the hypoglycemic queasiness that comes from not eating for awhile, and the gelatin coats and soothes your throat and stomach. I have found this to be one of the best tolerated foods for patients who are nauseated, and it can also do wonders for a sore throat.