Children's pedialite is the best way to get fluids in you. It has zinc, salts and electrolite and a few other minerals to combat fluid loss. Drink 2 liters a day plus other fluids.
Tip- Was in the dollar tree today and saw that they have 0.5L bottles for a dollar, which is $2 per liter, or about 30% the price of the pharmacy.
The flu is REALLY bad this year and could be a historic season.