In most emergencies, food isn’t a priority. Depending on your extra reserves (love handles were never so welcome), it takes a month or more to starve to death. Conserve energy and water by staying put rather than foraging. “The fasting body taps into its fuel stores,” Nester says. “In survival situations, people can last 25 percent longer this way compared to those who burn calories looking for a measly morsel.”
But you can graze on nearby food like: acorns and other tree nuts; ants and ant larvae; grasshoppers and crickets (roast these first to avoid stomach upset); and fish.
To make a fishing spear, carve a 10-inch tip onto a sturdy stick about eight feet long and 1.5 inches thick; saplings work well. Harden the tip in hot coals for a few minutes. Then pin a fish to the creek bed and grab it with your hands.
Hole up in the shade and wait until dusk to hunt for water. If you have a bottle of liquid left, drink it at your normal pace, or until your urine is mostly clear. “Rationing water, especially in the desert or the tropics, hastens heat exhaustion,” says Nester.
Top spots to look: shady areas at the base of north-facing cliffs; islands of green vegetation; rock depressions; tree trunk cavities; undercut banks or shady, outer bends in dry riverbeds; and anywhere you see birds and insects gathering. No sources nearby? Head down gullies, or dig wells with your knife: Find a spot that’s likely near the water table such as a riverbed. Dig a few holes, about two feet deep, and wait five minutes. If water seeps up, line the hole with pebbles so it’s less porous. Sop up mud with a shirt and wring the moisture into your mouth.
No purification method?
Guzzle anyway. Most water bugs take weeks to incubate, but you can die in days from dehydration.