Yes drink more than 4 liters of water for normal people shall face health problem too. One of my friend got his kidney removed since he practicing drinking more than 2x 1.5liters bottle a day, or more.

He also got a kidney stone before and removed by laser blasting at singapore which cost around qr25,000.

So he keep on advicing people not to drink so much water.

Yes 2 liters per day look okay.

One more thing, if you go to chinese sensei medical shop, they did add some special stones or sands to the medicine to remove kidney or urinalbank stone.

Btw, the pain of this stone is ten times the pain of woman delivery a baby without painkiller jabs.

So be carefull.