Put a small piece of ginger in your mouth. Keep it for some time and swallow its juice. You may not like the taste but it will definitely give you the calming effect. In no time, the sourness in your throat will soothe down a lot and you will feel much better. You may not know it but this terrific method helps in neutralizing a poor taste in your mouth.
Source : https://timesofindia.indiatimes.com/life-style/health-fitness/home-remedies/this-one-simple-remedy-will-help-you-treat-cold/articleshow/62459760.cms