I'd recommend you check out Kiwix [1], an app but also a decade-old effort to make portable, offline working wikipedia copies. Coupled with a decent phone/table

I'd recommend you check out Kiwix [1], an app but also a decade-old effort to make portable, offline working wikipedia copies. Coupled with a decent phone/tablet and there you have it... Or maybe you're more inclined towards a "FM 21-76 US ARMY SURVIVAL MANUAL" kind of project? [1] https://www.kiwix.org/en/ https://www.kiwix.org/en/