According to the Rule of Threes, how long can a person survive without water?

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The Rule of Threes is a quick guide used in emergencies to prioritize needs: you can usually survive about three minutes without air, about three hours without shelter or warmth in harsh conditions, about three days without water, and about three weeks without food. For water, the threshold is roughly three days because dehydration progresses rapidly and essential bodily functions rely on fluid balance. In hot, physically demanding, or sick conditions, that time can shorten, while cooler, calm conditions might stretch it a bit, but three days is the standard takeaway.

So the option stating about three days without water matches this guideline and explains why water becomes the next critical need after air and warmth. The other timeframes fit other survival needs (three minutes for breathing, three hours for shelter/warmth, three weeks for food) and aren’t about water.