From the Tom Brady “TB12 Method” book:
If you weigh 160 pounds, via our rule of thumb you should be drinking at least 80 ounces of water per day. Assuming you’re up by 8:00 a.m. and in bed by 10:30 p.m., that’s a glass of water every couple of hours.
But I’ve read of another doc who said we could damage our kidneys by ingesting too much water. Damned if you do..., etc.