@sirwinchester You should never drink that much water all your doing is flushing out the electrolytes you need to live only drink water when your thirsty , i used to believe this myth as well.

this only works with fresh spring water and maybe mineral water but nothing else.

When you drink too much plain water, your electrolytes no longer can balance the exchange of fluid inside and outside the cell. This causes parts of your cells to swell and others to dehydrate (due to loss of salt).

Also, realize what you input doesn't equal what you output. If you drink a glass of water, you do not urinate a glass of water. You will urinate a glass full of urine, which is filled with electrolytes and other stuff. So urine is flushing out minerals.
https://en.wikipedia.org/wiki/Dehydration
https://en.wikipedia.org/wiki/Water_intoxication
https://en.wikipedia.org/wiki/Water_cure_(torture
https://en.wikipedia.org/wiki/Hyponatremia