IF you drink 5 gallons of watter a day you really need to start mixing some salt in with it. That mutch watter will dillute the electrolightes in your boddy and make nerves stop working. Basically your heart stops recieving the pulse to make it beat and stopps.
Usual day at the temp now 40-60 oz's a day. Have drank uppwards of 12 litters in a day tho. Hiking in the desert will take it out of ya quick. You can conjstantly be sucking down watter and be dehydrated.