handheld radios
Get yourself a pair of Baofeng UV-5R’s. This is the cheapest solution to get started with communications independent of a 3rd-party / centralized cellular network.
long distance radio communications
encrypted communications
(Note: for educational purposes only. The FCC prohibits amateur radio users from transmitting “messages encoded for the purpose of obscuring their meaning” i.e. encrypted communications. In emergency situations however, it is good to have this knowledge and capability.)
meshtastic