This site is primarily aimed at third-world solutions, but I consider a true SHTF event to be a trip to a third world country...
https://www.engineeringforchange.org/solution/library/viewAllThe projects cover a wide variety of subjects:
Water, Energy, Health, Structures, Agriculture, Sanitation and Info Systems
Warning, the menu system is not intuitive and you may have to wander around to find the items of interest.
Worth looking at this catalog and making copies of the plans. Most appear to be PDF format documents.
I found the following, among many others:
a 5 gallon bucket water powered generator system
Clay and "rocket" stove design and construction
A "dirt" bacteria powered electric cell (small power, lights an LED, could be expanded)
Biogas digester designs for village size systems
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