Master cleanse is good. I have done a few of those recently. But fasting is the best way to balance. Nature makes every living thing with a program not to eat everyday. We don’t rest our digestive system and endocrine system.
Julia, if you are strictly talking about tonsils, best thing for tonsils is Sea Salt and warm water gargles, even better would be to add a few drops of Iodine to it. But if you are fasting then I would not put anything in my mouth except water.