Just in case Elon Musk's Neuralink devices turn most of the global population into the Borg or the echo chamber causes the internet to implode, we might need a back-up plan for figuring something out if we can't Google it anymore. As long as you have your internet-less smartphone and a solar charger, the Offline Survival Manual app can be your guide.

This free, open-source manual gives information on survival basics such as building a shelter, starting a fire, finding food and what to do in medical emergencies including a snakebite, broken bones and wounds.

Come to think of it, this manual also works in case of a zombie invasion although sadly there isn’t a section on annihilating the undead. There is, however, a chapter on water purification and filtration, edibility of various plants and how to catch and cook fish, so this Android app could double as a weekend camping aid if the apocalypse fails to arrive.

https://play.google.com/store/apps/details?id=org.ligi.survivalmanual&hl=en