Why is water important to your body?

Your body uses water in all parts inside your body, water provides an efficient way to transfer substances from a cell to the cell's environment, your body also uses water for your organs, and tissues, it also can be helpful to your skin so it's healthy, so I don't think you can live without it.

Please correct me if I'm wrong :)

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex