YSK The Survival Rule of Threes Why YSK: It could save your or another’s life. You can survive for 3 Minutes without air You can survive for 3 Hours without shelter in a harsh environment You can survive for 3 Days without water You can survive for 3 Weeks without food Remember: 3 minutes, 3 hours, 3 days and 3 weeks. —————— (Slightly More Detailed Version) You can survive for 3 Minutes without air (oxygen) or in icy water. You can survive for 3 Hours without shelter in a harsh environment (unless in icy water). You can survive for 3 Days without water (if sheltered from a harsh environment). You can survive for 3 Weeks without food (if you have water and shelter). —————— ETA: These are good general guidelines to know so you can start itemizing needs in a contingency, but it’s most useful so you can *prioritize* your needs. Eg, you’ve got air, proper attire, shelter and food, but no water? Make sourcing water your priority.