You can use what you already have at home and save cash. I just found this and hope it can be helpful. The Procedure: Mix some salt and baking soda in water. The ratio should be 1:1 [if you need to make more of it]. For every one teaspoon of salt, you use one teaspoon of soda mixed in 100ml of water. After you mix your stuff, use your solution to rinse [or if you want to, gargle]. You'll find that it works perfectly though the taste might not be the best.
Funnily enough I actually enjoy the taste, for the cherry on the cake, you should dip your tongue scrapper into this solution if you use one. It's a very effective remedy that I can attest to. Never tried gargling though, so it will be interesting to see if there is improvement by using a combination of the two.