There is no need to worry... 71% of the earth is water... There is approximately 326 million cubic miles of water on the planet and we have the tech to make all of it drinkable.
We will never run out of water.
Water is the source of all life. Seven tenths of this earth’s surface is water. Why, do you realize that 70% of you is water Mandrake?! , “And as human beings, you and I need fresh, pure water - to replenish our precious bodily fluids”.
https://www.youtube.com/watch?v=XeU1CwJkwX8