How to care for son with flu?

My son has come down with a flu that has his head full and taken his appetite away, has had diarhea. Coughs and sounds very congested. He is coming home for me to care for him.He has had it for a week already and says he's not much better.He had taken decongestants faithfully, immodium when he needed to and Pedialyte to drink. Sometimes nyquil to keep him calm at night. What should I get him to eat when he starts feeling like eating?SHould I make him take a hot bath or just let him sleep it off?

He's 26, been touring in a rock n roll band for 3 weeks.This has basically knocked him off his feet.Maybe sleeping in a real bed will help also.

It would be helpful to know your son's age, as dehydration can be an issue with younger children (and adults as well, if diarrhea and vomiting are an issue). At any rate, I recommend the BRATT diet:
Bananas
Rice
Applesauce
Toast
Tea

Gingerale and 7up can sometimes be tolerated better than other liquids. Room temperature is much easier to handle than very cold or very hot liquids. Small sips should be taken. If he's super congested (head and lungs) an over the counter syrup w/ guanefeisin is usually helpful. I don't like nyquil because of all the additives and alcohol; may be better to take some tylenol and benadryl at night for pain relief and sleep help; the benadryl will ease his nose breathing and stuffiness. Chicken soup is always good, with some rice or noodles. The important thing is for him to get to a place where he can manage food and it's not causing "either end" symptoms. Milk/products should all be avoided; in some people they thicken mucus. A hot bath may help sore muscles, but he should take care not to get chilled between bath and bed. Bland is good; he needs a little salt and sugar for hydration so pedialyte (nasty stuff) will work; also gatorade and some other sports drinks. Avoid caffeine.