He is averaging about 4 miles of running per day for a seven day week and around 30ish miles everyday riding. Not to mention it's been super hot. I was told the rule of thumb for gauging water is half your body weight in ounces. That is for those not exercising at all. So if he is 180 lbs the base line amount for everyday function would 90 ounces. Since each water bottle is about 24ish ounces and he's drinking 3 of these for a more than 3 hour ride that is only 72 oz of fluid for running, cycling and what he needs for normal metabolic processes. Unless he is drinking like mad afterwards, he is grossly dehydrating himself.