See your problem is that your limiting your thinking about water in terms of what comes out of the average kitchen tap my good man.
The majority of the water on the planet is locked in natural stores like ice and oceans etc etc and this is mainly out of our abilltiy to use. Evaporation from the ocean or melting ice gives us water which falls on the land or flows down the mountain to fill the streams and aquifers, we then take what we need for agriculture and industry.
The more water we lock out of the cycle and the faster we use it the more likely we come to a place where billions upon billions of gallons of water is stored in oceans but is not evaporating fast enough to fill your domestic water tank. We could never use up all the water on the planet however we can use up all the water in the cycle which moves seawater from the ocean to the land as freshwater.
hence water water everywhere but not a drop to drink
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