Lofty Wiseman's excellent guide to surviving anywhere is now freely available (and 100% legal) from the Internet Archive in a variety of formats.epub,kindle,pdf etc All 576 pages with illustrations, it will keep you busy till your next adventure.
https://archive.org/details/SASSurvivalHandbookTheUltimateGuideToSurvivingAnywhere
https://archive.org/details/SASSurvivalHandbookTheUltimateGuideToSurvivingAnywhere