If you look at Maslow’s Hierarchy of Needs, you see that the most foundational level deals with basic survival needs. The things our bodies need to stay alive; or in other words, survival. If we can’t survive, nothing else really matters.
Yet in our modern society, we rarely think about these items, except from a convenience point of view. We don’t worry about having water to drink, we worry about what sorts of drinks we’ll have available to us. Most of us don’t worry about having enough food to eat, but whether it will be the food that we like. This is mostly because we have plenty of the basic things needed for survival. But we could lose all of that in a moment, without notice.