Also don't forget you need lora nodes to bridge farther areas or different sites. And you need them before shit happens.
I recommend MeshCore for longer range comms and then you can bridge it with bitchat: 
GitHub
GitHub - jooray/MeshCore-BitChat: A new lightweight, hybrid routing mesh protocol for packet radios
A new lightweight, hybrid routing mesh protocol for packet radios - jooray/MeshCore-BitChat