Using salt water to treat a sore throat is a well-known remedy. The salt helps to reduce swelling, and it may also help kill unwanted microbes in your throat. You need to mix a teaspoon of salt in a glass of warm water.
You can add a little bit of Honey. Gargle with the solution, do not swallow it. Spit the water out after gargling.
Do this at least three times a day to get a better result.