Electric vehicle mandate in California

This kind of leads to another question. If a wildfire, tornado, or other natural disaster knocks out power in a region for days. How do you recharge your vehicle to escape? With my ICE vehicle, I just go the fuel station and get about 10 gallons of gas/diesel just in case (which I have needed on a few occasions). What do BEV owners do? A lot of people recharging right before a disaster would put a lot of strain on the regional power supply. What do you do if your only escape vehicle isn't recharged?

Also, if the trucks delivering relief supplies are electric, then how do they recharge? I know it took weeks for the electricity to come back to the area after the the last major hurricane in Rockport.