Until SHTF, you can't hand out radios and operate on any frequency without disregard to the other users unless you want to incur penalties.
General Mobile Radio Service also known as GMRS is the most sensible radio system to invest in. MURS is limited to 2 watts and 5 frequencies. Repeaters are illegal on MURS. A Ham licenses does not cover individual family members, each must have their own license to transmit. I know some people are using marine band non-commercial freqs on land and that is not legal. CB radio is prone to interference from skip during certain times of the year and sunspot cycle. FRS is a joke, those 3 inch antennas just don't radiate well, even if they have the higher power GMRS channels built in. These radios cannot even be used on a GMRS repeater, they are simplex only.
GMRS mobiles and repeaters can operate up to 50 watts of power and there are no restrictions on antenna height. Although the range on VHF is a little better, UHF GMRS signals penetrate buildings better and the signals bounce off buildings in urban environments. There are 8 simplex freqs where 50 watts are allowed and 7 more simplex freqs for 5 watt handhelds. A license is $85 for 5 years and covers immediate and extended family. You can put up your own GMRS repeater or may find someone nearby with one already on and willing to let you use it for sharing the cost or for nothing.
There are retired "wideband" only UHF radios that have flooded the used radio market in places like Ebay that can be bought for a song and reprogrammed for GMRS use.