[JensRex]

If your body isn't already "flushing out toxins", you are suffering from liver or kidney problems, and you should see a doctor immediately.

[_y5hn]

It's established the body needs water. The contention is only about how much and when to drink it. It's not far fetched there's some timing that are more optimal than others. Too much is bad, and too little is also bad.

There's also exhaggerated sales-claims from believers ofc.