If you dring 100% pure water and then absorbie it you will mix it with the blood that is not just water but have minerales like sodium dissolved in it. Your kidney can’t produce 100% pure water so when urine is produced there will be minerals in it. The result is that the number of minerals in your blood will decrease.
The amount of sodium in the blood required for you to live is a quite narrow range. Both to much and to little will kill you.
It is not just sodium. You need calcium and other metals for your skeleton and exactly the same way it will be expelled in urine and the level in the blood get too low.
I suppose you could drink 100% pure water if you alos consume what is dissolved in normal water too like in a tablet that gets dissolved. So it is just drinking the water without any other changes that are the dangerous part.
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