Gingerale or gatoraide or even sprite. Also I've been told to take coke, yes the soda, this will sound weird but...boil it down and drink the syurp for an upset stomach. Or I guess you could let it sit out and go flat but that takes a while.
I got that bug last week and it was uncontrolable. Nothing made it feel better. NOTHING. But keeping fluids down was the main thing. Here are my ideas.
Salt is good for you when your sick like that because it helps you retain fluids so you don't dehydrate. I
would recommend a can of chicken broth, or those cup of soups cambells has out with the sippable lid, saltine crackers, the gingerale or w/e, a movie like was stated above or a small video game (you know hand held cheap-o that runs on AA's?) and a small handmade gift. The week I was sick I recvd my swap pacakge and I was so overjoyed
Hope your friend gets well soon