My common sage petered out last year and needs to be replaced. Should you have a need to treat a sore throat please tell me how it works for you.
Grannies I have known use vinegar as a gargle for sore throat. This has always worked very well for us even on very bad sore throats.
The initial shock is startling but soon the pain is eased. Repeated use every little while soon heals the throat. The well known antibiotic character of vinegar makes it a natural for bacterial infections.
If full strength is too much to bear, dilute it a bit with water.
Never put off until tomorrow what you can do today. If you do it today and like it you can do it again tomorrow.