[ ] maps app with downloaded local ( and other maybe important ) map data
[ ] fdroid ( google play might not work - in fdroid you can point to alternative repositories )
[ ] Light app
[ ] Compass App
[ ] Game app to fight boredom and keep the mind stimulated - e.g. gobandroid to play the ancient game of go which has simple rules but is still immensely deep
[ ] Pass app - e.g. PassAndroid - just imagine how sad it would be if you get the ticket to the rescue ship in esPass format and have no way to display ..-)
[ ] Material Tea timer ( tea will be a thing in these situations )
[ ] Music app ( downloaded / offline - no streaming solution ) and some uplifting music ( I suggest DUB or reggae - but pack whatever works best for you )
[ ] A cryptocurrency wallet - fiat money/banks might not work anymore - have a crypto wallet ( like the Bitcoin-Wallet from Andreas Schildbach ) and transfer a little bit of value on it