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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.
Also, since dairy cows tend to produce twice as much milk as beef or range cows do, dairy cows tend to drink more water on average than a typical beef cow would. So a 1000 lb lactating beef cow may drink around 15 to 20 gallons per day, whereas a 1000 lb lactating dairy cow may drink around 30 to 40 gallons a day. If a certain feed is higher in salt content than another, a bovine will drink more water to counteract the amount of salt that is found in the feed.