I’m specifically drinking Dunkin Donuts bottled iced coffee. It says it contains skim milk in the ingredients list.
In: Chemistry
Things are often more than the sum of their parts.
When you have a bottle of fresh milk, it contains just that: Milk.
Milk has a spoilage time/expiration date because of the properties of milk.
When you have a pre-packaged bottled iced coffee product like the one you mention it’s got some milk in it, but if you look at the ingredients there are a host of other things in there. Not only the fact that the milk is in solution with the rest of it, was likely UHT pasteurized (pasteurized at ultra high temperatures which normally affects the taste, but since it’s mixed in the drink doesn’t matter), and that also some of those ingredients themselves are preservatives, all lend to the ability for that product as a whole to last much longer before expiration.
In this case:
https://puu.sh/EGn0E/7e512f65ca.png
The Potassium Phosphate is specifically added to extend shelf life of the product.
https://puu.sh/EGn1x/a72dd6c699.png
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