That works with clean water. Most people can go a few days to a week without water ("3 days" is an oft-quoted factoid), but that's about it. Having water, surv

That works with clean water. Most people can go a few days to a week without water ("3 days" is an oft-quoted factoid), but that's about it. Having water, survival without food is hard limited on a person's body fat and their metabolic rate. For example, I have 80 lbs / 36 kg of sacrificial body mass. Assume extracting 3400 kcal/lbs of fat and a 2000 kcal/day RMR (let's call it 2500 because of activity). That works out to ~109 days / ~3.5 months of survival. IANAD: Also helpful to prevent death & long-term damage would be: - electrolytes and minerals (Na, K, Mg, Ca, Fe) - vitamins (c, b12, a, b-complex, e, k, d) - small quantities of lipids to empty the gallbladder to prevent gallstones. To accomplish this, a six-month supply of multivitamins, a dried electrolyte mix and a large bottle of shelf-stable oil would be the bare-minimum. (Do the rationing math ahead-of-time so that you don't die.) Even better would be to avoid this scenario altogether: - carry a properly-registered GPS PLB ($250-400 USD) with a maintained battery (I saw one model of PLB lasted 5 years, after which it needed replacement at a dealer for an unspecified cost. It also has a hard limit on the number of self tests that can be performed without a battery replacement service. This is exactly why we need the right-to-repair. I came across a PLB with an user-replaceable battery, but it's $1000 USD and the batteries cost $175 USD (when it costs about $15 to make), so clearly the PLB business-model is a razor-blade/inkjet-printer economy that is all about planned-obsolescence and lock-in.) - a signaling mirror (with aiming hole) - a multi-chamber, insanely-loud, rescue whistle