For reliable communications you need to have a plan.
First thing is having a radio that covers the frequencies you need.
For Operation that does not require testing:
A Citizen's Band radio, preferably one that has single sideband (SSB).
A couple of handy-talkies that cover GMRS, FRS, and/or URS.
A short-wave all-band, all-mode radio that can operate from battery.
For Amateur Radio Operation
The same equipment as above, plus these.
A couple of handy-talkies that cover HAM bands in the VHF/UHF range. You may find some that cover both the HAM bands and GMRS/FRS/MURS.
An HF radio that can operate from 12V or from a power supply in your home, and has transmit power up to at least 100W.
A VHF/UHF mobile radio that operates from 12V in your vehicle or from a power supply in your home.
Second is having proper antennas(s) to cover all the frequencies you wish to operate.
Alternate antenna for stealth operation and repair parts in case your antenna is damaged by storms, etc.
An antenna for portable operation at a campsite, etc.
Third is having some type of emergency power for your radios.
Solar cells.
Battery chargers.
Spare batteries.
Inverter/Generator. The inverter styles have better output regulation whereas a regular generator may damage some electronics.
Fourth is having all the manuals and accessories for your radios.
Most of the new radios have programming cabilities, multi-function buttons, and advanced features that you don't use every day.
Make sure you aren't stuck unable to use your radio when you need to input a new frequency, etc.