Of course you can freeze milk, I used to do it all the time. When defrosting it, wait until it is totally defrosted then give it a good shake up .

Colleen is right, milk freezes beautifully.

I've frozen milk just fine as well. And yes, you do need to make sure it's totally defrosted- I made the mistake once of only letting it get part defrosted, and it wasn't great. If your freezer isn't full- top it off with frozen water bottles.

If you can get dry ice, try it- but keep in mind that dry ice does offgas as it "melts". Carbon dioxide, the same stuff we exhale. So you really shouldn't use it in your fridge or freezer- the seals can be a problem, the dry ice gas build up could even cause the door to pop open. Look up Dry Ice Bomb.

Instead, use dry ice in a non-sealed cooler, and store your fridge perishables in the coolers. Stock the fridge with frozen water bottles.

Yes, milk freezes great. I remember back when I was a kid and Dad was working out of town, in a large city. He could buy milk at a much cheaper price than it was in the small town where we lived. He brought home 4 gallons of milk every weekend & Mom froze it. I had two toddler brothers; we went thru a lot of milk!

Now, I buy a gallon of milk & pour off a bit less than half of it into a plastic half gallon milk jug and freeze it. Milk is much cheaper by the gallon here but a gallon will go bad before we can use it up. It's also nice to have a back up supply in the freezer to save having to make a trip to the store for just milk, especially during our very cold winter.

About the power outage...

Make sure that your freezer is full. One easy way to do this is fill milk jugs with water and freeze. (Leave some head space because liquids expand as they freeze).

You can wrap your freezer with blankets, bed blankets, afghans, polar fleece, moving blankets, whatever you have around, even winter coats/ parkas, down comforters.... Or, as DCarch has suggested on past threads, take a trip to a home improvement store and buy sheets of foam insulation---the pink or blue stuff has a higher R value than the cheap beaded styrofoam. You can cut the insulation down to use as a freezer cover box. Assemble together with some duct or packing tape. (You could even make some divots in the insulation and glue or tape rare earth magnets to the insulation to hold the insulation in place on the freezer or refrigerator.)

If you bought lactose free milk, then there is a very good chance that it also happens to be ultra high temperature pasteurized. For some reason, those to things seem to go hand in hand in the US, even though they should be entirely unrelated.

If it is indeed UHT milk, then you can almost completely disregard the expiration date. It's going to be shelf-stable for months even without refrigeration. Once you open the container, I suggest refrigerating it. But the sealed container keeps for a really long time.

In Europe, they usually sell UHT milk on open shelves and they advertise really long expiration times. But in the US, consumers would freak out if they saw that. So, in order to meet expectations, they still needlessly refrigerate UHT milk.