milk can be frozen, pour half into an empty bottle and defrost when needed.
I was dubious so I looked it up...
Use plastic container, label with the date plus number of days left of until expiration. "Once you thaw milk, it'll expire in the same amount of time it would have if you'd never frozen it. So if it had 10 days to go before its expiration date, you have 10 days to use it once it's thawed." Defrost in refrigerator or in bowl of cold water. https://www.wikihow.com/Freeze-Milk
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