What is the best treatment for influenza?

Rest, fluids, and... ...Fever reducers (aspirin, or acetaminphen) . There are two approved drugs that can reduce symptoms, but only if started within ~24 hours of symptoms. Most people will have a self-resolving illness. But its not fun to have the flu, and the best strategy is prevention. Get your annual flu shot. Wash your hands a lot (during flu season especially). Buy and use hand sanitizer gel.
Tx. If you have the Flu hydrate well w water, herbal teas, soup or juice. Drink sufficiently to have pale to light yellow urine. You can use pain relievers like Tylenol (acetaminophen) or NSAID’s. Rest A LOT! In some situations antiviral medications (Tamiflu, Relenza, Flumadine) may be prescribed within the first couple of days of symptoms to hasten healing or they can be used after flu exposure to prevent illness.