Did you know that there are some pure essential oils that are safe for consumption? The keyword you want to look for on packaging is "safe to use internally." When I feel a little scratchiness in my throat or stuffy congestion creeping up, I apply a scant drop to my tongue and swallow repeatedly. If you are sensitive to spice, do not try this! Oregano oil is super, super spicy. I love it, because it sort of desensitizes a sore throat.
My go-to oregano oil is North American Herb & Spice Oreganol ($30), which I discovered at Whole Foods. I believe this product is blended with extra virgin olive oil to make it "safe for everyday use." Pure essential oils are very potent! You should never ingest essential oils except under the care of a trained and qualified specialist.