[PA Engineer]

The main addition I’d make is a portable water purifier, and in my case, HF communications gear and associated antenna and power source. But anyone should carry a portable shortwave radio and a pair of GMRS walkie talkies for local area comma.

Agreed with everything you posted.

[Bonemaker]

Excellent suggestion. Get an amateur license and a good handheld with hf (long distance) capability. However, if it gets to SHTF nobody is going to be checking FCC violations.