A Woman Outside Brooklyn -“Of course, once those cartons are opened and the donuts come in contact with the triefess is the stores, that’s another story.”
apushatayid -“If you really want DD and want to be certain about the kashrus of the coffee and everything else in the cup as well, invest $10 on a 4 cup percolator, buy a bag of DD coffee (many flavors have a hechsher), buy whatever milk you normally do, buy any and all flavorings that have a hechsher you are confortable with and enjoy your coffee.”
Or the easiest way to buy stuff in DD’s is to stick with the ones with Hechsheirim. Nowadays they have these all over the place. Brooklyn, Teaneck, Highland Park, Lakewood & Balto. are the ones I know about. I’m sure there are many more places too.