Syrup
This cough syrup comes in really handy...

Ingredients

You will need a 1/4 ounce of the following herbs.  Powder form if available.
Licorice (mainly for flavor, but works wonders as an expectorant... can be substituted with Wild Cherry bark)
Slippery Elm (helps to coat and strengthen lungs to prevent fluid build-up)
Catnip (Cough suppressant)
Mullein (great for helping the lungs themselves)

quart of water
two ounces of honey or glycerin
glass or plastic jar with lid
strainer

Add the herbs to the water and gently boil the quart down to a pint.  While still warm, add the honey or glycerin.

Dosage:
adults: 1 tblsp every four hours
children: 1 tsp every four to six hours