Get the book from a library. Read it. Follow the instructions. If it works you'll be grateful. If it doesn't you have absolutely nothing lost but time. Water doesn't cost much and neither does sea salt. Both of those things you probably have anyway.

If it doesn't work then you can contact the author and set up a way to verify doing the protocol (a second time). Then when it doesn't work the next time you do it just collect the check.

It works for high blood pressure too because rehydrating the body thins the blood and the pressure drops.