If you ever frequented the same establishment (I wouldn't) would they refill the bottle with egg nog?
As already said by Santaman2000 the stores don't make it they just buy it in and flog it on. Heck even our local store touts "In Store Bakery" Nah more like in store warming oven. They get the bread and rolls in half cooked and they finish it off.
Anyway the reason I looked at this thread and got totally side tracked was beeps. Our microwave died recently and we bought a cheapie as a replacement. This one didn't come with a "beep off" opition and after a couple days it drove is loopy. Peace returned to the kitchen with the judicious application of wire cutters in the right place.
Santaman2000 is right about the milk deliveries, I miss the chink chink of the bottles as the milkman come up the path at 4 or 5 in the morning