Now that we know what bracha to make on non-kosher food, as detailed in this TftD , we are ready to address the original-ish question. (It is only "-ish" because that question was about water, which gets a resounding "no," but the question of using non-kosher wine is still open.) But, first, a joke. A Jew is meeting with a non-Jew at the non-Jew's house while the non-Jew is having a snack of ham and wine. (The reaons for the meeting and why at the house of the non-Jew and why the non-Jew choose this moment to eat are all beyond the scope of this joke.) The non-Jew is cordial and offers the Jew some ham. "No thank you. We only eat kosher food." The non-Jew is a bit surprised (again, outside the scope of this joke), but still wants to be a good host. "Well, may I at least offer you some wine, then?" The Jew replies that we drink kosher wine. Now then non-Jew cannot contain himself, "So if there was only non-kosher food and wine available, ...
The discussion started with, "If one of the hostages in the tunnels found some water, could he use that to make kiddush?" The answer to that question is a definitive "No." You just can't make kiddush on water (Shulchan Aruch 272:9). The Mishna Brura refers us to 296:2, sk 10, and notes that you also may not use water for havdala, and that is true even if the primary beverage in your country is water; it is just not considered prestigious enough to use for kiddush. Even crazy expensive—apparently there are "extreme luxury" waters that go for more than 10k$ for a rivi'is—still can't use it to make kiddush. Okay... but all this got me thinking... what exactly are the rules regarding eating non-kosher food when one is in danger of dying without eating that food? When I started, I was pretty sure that one would not make kiddush using non-kosher wine. Using non-kosher wine or food just didn't seem appropriate for kiddush. I also wondered what bra...