Stupid, IMHO. Just ensure that there is a functional PLB and get rescued before dehydration becomes that big an issue. Heck, for the added cost, add two (or 3 or 4) PLBs for back-up.
Lost of these ideas cross my desk, usually by someone who has minimal experience in the subject matter and has no understanding of the advances in technology since the bad old days. They latch onto one or a few survival experiences from poorly prepared individuals or from years ago, and cannot see that everything changes with minimal preparation and/or modern technology.
Yes, I'm in a grumpy mood today...