Salt water. Flush yer sinuses and rinse and gargle. Lots of fruit... LOTS of fruit. Wrap yourself in towels and blankets and sweat. Pinch your nose with a clothes pin or stuff it with tissue for as long as you can(this is the key for a cold as the rise in temp kills the beasties). Drink as much fruit juice and water as you can.

As you do not take alcohol I shant talk about the rest of the magic cure. Alcohol is not just a killer of "germs", it helps you endure the rest of the cure.

It does work.... within 72 hours, as long as it's a cold.