Most people when in a natural body of water won't drink from it even though all the water we do drink ends up coming from natural bodies of water, amirite?

It's almost as if natural water hasn't been cleaned and could have various germs and animals that will cause you to get sick.

No. Water is pumped up from deep underground. Before the water is pumped up it filters down through the earth. Taking many many years.

Surface water is not for drinking without treatment. Unless you want to risk getting really sick.