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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.
Probably the best way to drink raw milk and have peace of mind even if you are not completely sure of the cleanliness of your source is to freeze the milk for two weeks first before thawing and then drinking. Food or drink frozen for that period of time is considered safe to consume.