The warmth of an old-fashioned mustard plaster relieves symptoms of many respiratory ailments, including bronchitis. Take 1 tablespoon dry mustard and mix with 4 tablespoons flour. Stir in enough warm water to make a runny paste. Oil the chest with vegetable shortening or olive oil, then spread the mustard mix on a piece of cloth -- muslin, gauze, a kitchen washcloth -- and cover with an identical piece. Apply to the chest. Keep in place until cool, but check every few minutes to make sure it doesn't burn the skin. Remove the plaster if it causes discomfort or burning.
Ginger is also a potent expectorant that works well in tea. Steep 1/2 teaspoon ginger, a pinch of ground cloves, and a pinch of cinnamon in 1 cup boiling water.