Really the ultimate reason why humans and nearly every thing on Earth need water to survive is evolution. Water is the second most abundant thing “on” planet Earth besides air. So everything evolved with the basic fact that use of water would never be an issue.
Secondly water is good at mixing with things. It will easily connect with other molecules and that makes it useful for transporting stuff around your body. Without that intake that process becomes hard and slow. For example, if someone were to die from dehydration their blood would be like a thin syrup. Which in really means they died because their heart couldn’t pump that thick blood fast enough to keep the body alive.
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