8-10 cups of water

Hi Sue, Yes, is it called water intoxication but it only occurs when someone drinks say 1-2 gallons usually in short period of time.  The 8-10 cup rule is a general recommendation but as long as your kidneys are functioning normally, your intake of 15-20 cups per day should be just fine.   Danielle posted a nice piece on fluid needs last week so you might want to look for this post as it explains how fluid needs are calculated in the health care field.   Cheers,