I can not cite any Halachic sources, but I do know that it was always (as far as I can remember) acceptable to buy black coffee (especially when traveling.) in any non-kosher food establishment. Not to speak of the Kosher ones. But on the subject of “Marris Ayin”, I had an interesting thing happen to me. I bought a sandwich and coffee in a Kosher establishment and went (without thinking) next-door, to a treif luncheonette to buy a newspaper. while in there, the thought hit me about the appearance of walking out with a sandwich from that place. That is, when the Mishna in Mass. Avos;??? ?? ?? ?? ???? ??? ???? “And You Shall Judge everyone on a Benign Scale”. Meaning to give everyone the benefit of the doubt. came into play.
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