On infectious diseases prevention you need to keep your hands clean at all times, try not to put your hands in you eyes and mouth. Wash your hands all the time. Clean all areas where people are located.
Flu virus doesn’t have much medicine that will do anything. Zinc, Vitamin C, echinacea, green tea, honey all help.
For the throat apple cider vinegar kills everything. Also pain killer(Aspirin, ibuprofen, or Acetaminophen) will help with the fever. Prevention is the key. Gloves and masks will be needed if it is an airborne virus.
A sick room is a good idea, buy plastic and duck tape to seal the room. But the sick room is only for infectious diseases.