You can freeze milk, but remove a cup of the milk, due to the expansion while freezing. Thaw in the refrigerator. Whole milk may separate more than 2% milk.
If you want to have milk on hand in case of an emergency, stock up on powdered milk and maintain a supply of bottled water with which to mix it. Shelf-stable milk must be refrigerated after opening and has a shelf-life of just a few months.
Milk can be frozen and kept for quite some time - I think up to six months. Make sure to leave extra room on the top of the container when you freeze it, because it will expand!
I would suggest bying cans of condensed milk instead of cartons. Cartons of milk go bad quickly while cans of condensed milk last for years. Then you can add water to the condensed milk whenever you wish to drink it.
