Water is an uncountable noun.

Water is a bivalent compound.

The water treatment plant uses a deionization process to remove ions from the water.

The water treatment process helps to demineralize the water, removing mineral content from it.

He drank the water thirstily.

Plants thrive in sunlight and water.

Water trickles down the mountain.

The flowers wither without water.

I drank a glass of water.

The whale breached the surface of the water.