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Hyperhydration would cause you to have an imbalanced electrolyte level and could potentially be fatal. With a gallon of milk, it is much safer because the average person cannot digest the amount of lactose in a gallon of milk in one hour, which their body would cause them to purge it without harm. Source(s): http://en.wikipedia.org/wiki/Hypervitaminosis_D.
These may be good guesses, but the answer is the modern dairy cow. A milking dairy cow drinks about 30 to 50 gallons of water each day. During periods of heat stress water intake may double. Water weighs 8.35 lbs/gal, so a milking dairy cow may consume as much as 420 (or more) pounds of water daily.