Are there Halachic resources or books that can be recommended to a frum person who will be in a jail outside of Israel (and such country does not respect religious/human rights enough to provide kosher food or allow him not to do required manual labor on shabbat without further punishment) for a period of time?
8Not specifically your case, but Machane Yisra'el (by the author of Chafets Chayyim) is written for Russian soldiers and might have some relevance– b aAug 12, 2019 at 21:59
Also not a real answer but Aish.com posted this video about a man who kept Shabbat in a prison camp in Siberia for 20 years last night and it seems rather apropos aish.com/sp/so/…– יהושע קAug 12, 2019 at 22:16
4The Alef Institute may be helpful. aleph-institute.org/wp– LN6595Aug 12, 2019 at 22:21