There is a very logical progression of basic human needs. Without oxygen, a human will die in less than an hour. We need clean breathable air. Without water, a human a will die in less than a month. We need clean drinkable water. Without food a human will die in less than a year. Shelter is trickier because people can die of exposure and hypothermia in a matter of hours, but may be able to survive without it.
There is a very logical progression of basic human needs. Without oxygen, a human will die in less than an hour. We need clean breathable air. Without water, a human a will die in less than a month. We need clean drinkable water. Without food a human will die in less than a year. Shelter is trickier because people can die of exposure and hypothermia in a matter of hours, but may be able to survive without it.
Minor correction: You’re technically right, but you will die in less than a week without water and less than a month without food.