For years, one of my must haves when I’m down with the flu is a couple cans of Coke. For whatever reason, the sugar, caffeine and sodium in it have been a better pick me up, at least until I can handle more substantial things.

Gatorade, it varies from flavor to flavor if it stays down.
And saltines. But not just saltines, but saltines and a salt shaker.
Lick the top, add more salt and down the hatch.