There's still no cure for the common cold, which can be caused by any of more than 200 viruses. Antibiotics won't help a flu or cold: They treat bacterial infections, not viruses.
For a cold. Rest, drink liquids, gargle with warm salt water, and use a neti pot to flush the nose with distilled saltwater; suck on nonmedicated lozenges or swallow a bit of honey (don't give lozenges to young kids or honey to babies under 1 year old); and take a bath or shower to let warm, moist air loosen phlegm. Echinacea, vitamin C, or zinc lozenges might shorten the duration of a cold, but they won't keep you from getting sick.
For the flu. Rest and drink fluids.
Wash your hands to stop spread of cold germs. When people sneeze or cough, the germs that are making them sick are expelled into the air in tiny droplets. These droplets can get onto your hands. If you touch your mouth, eyes or nose, you may be infected.