This is a Bridge to Far
You know, I’ve occasionally watched the survival pr0n that you find on the Discovery Channel, both the rather more authentic Les Stroud, and the more entertaining Bear Grylls, and I think that this qualifies as Jumping the Shark.
In order to get water into his body, when the only water is fetid, and would likely cause illness/vomiting that might further dehydrate you, Grylls is using an enema to get water into his system.
This will work, just ask any medical professional, but seriously, enough is enough.