When I start to notice cold symptoms at our house, I put the kettle on to make thyme tea. I use fresh herbs if they are available, but dried herbs are fine too. I grow and dry my own, so I know that they are only as old as the previous summer. Dried herbs will keep for many years, but they do lose their quality over time.
How to Make Thyme Tea
Into a four-serving pot, I put a handful (about a quarter cup) of thyme sprigs, and six or seven sage leaves. Heat filtered water to about 205 degrees and pour over the herbs. Put the top on the pot to keep the heat in and let the tea steep for at least twenty minutes.