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Human industry and agriculture needs lots of water. The numbers are fairly large even for individuals.

Humans themselves need fairly small amounts for direct use like eating, drinking, hygiene.

>There is "plenty" of water for an individual in nature.

What do you mean by "nature"? Do you own the land where the water is, or do you simply plan on collecting rainwater? Otherwise, you don't own the water. This is a real-life problem that countries and communities the world over are dealing with.

Earth is populated by humans, not by a human.