[AnarchismIsCool]

I spend a lot of time in the RF space and Meshtastic is by far the most mature system out there for instant ad-hoc secure digital communications.

However...

The first rule of emergency communications is that if you can conceive of the need in the future, you need to practice using it now. Getting people to download the meshtastic app or figuring out a weird setting is a lot easier when you have working uncensored internet.