Here's why:

* Cellular Needs: All cells have fundamental requirements to survive and function. These include:

* Water: Essential for many cellular processes like transporting nutrients, removing waste, and maintaining cell shape.

* Nutrients: Provide energy and building blocks for growth and repair.

* Oxygen: Used in respiration to release energy from nutrients.

* Waste Removal: Getting rid of byproducts of cellular processes.

In your example, the organism needing water ultimately translates to the cells within that organism needing water to perform their vital functions.