And by contingency plan, I mean essential supplies in escrow, in another geographic location. A supply chain that can be invoked with several days' notice.
If you're a resident and don't have a generator (and fuel), building tools and small supplies of material, basic OTC medicines, and at least a week's supply of food and a way to purify drinking water, shame on you.
I know, Maria was a bad storm, and the island of PR is devastated. Even a personal food supply of a month might not be sufficient, but it's something.
As for their government, shame on them, big time. They should've been able to do more, but they're impoverished. If the "mayor" of San Juan is any indication of how they do things down there, it tells me all I need to know.
The evening before the storm hit I phoned my son in Guaynabo to make sure he was prepared. First floor of a 3 story concrete building and facing away from the south—check. Plenty of bottled water and food—check. Bottle of regular not fancy bleach—check. [Note: 1/8th teaspoon of bleach in one gallon of clear water, let it sit for several hours. If cloudy or muddy, filter through a fine cloth or coffee filter. Double the dose if still cloudy. Don’t use fancy scented or other “special” bleach.] Nearby stream to get water—check. I texted him after the storm and a day or two later he texted, “We are OK.” Text needs less power/bandwidth or whatever. He has phoned my US living son twice, and 3 days ago reported municipal water restored. When my husband was dying of Alzheimer’s at home, I built up a 3 month supply of food in case it was hard to go out in the last months. Fortunately, he was only non-mobile for 1 month at the end. I have read 2 novels on EMP type situations in the US. Really scary stuff.