Firstly, I thank God that my family and I are safe and our homes were not destroyed. I pray for those who are not so fortunate. In an extreme catastrophe, you cannot depend on others to bail you out as resources are stretched too thin. You have to help yourself and eachother. Here are a few of my observations after 11 days without power. I am not no expert, these are just observations or what I have read.
1 ) Safety- if they say evacuate, do it. If you decide not to evacuate, fine, just don't call 911 in the middle of the night when your house is swept away. This happened numerous times and is not fair to the resuers, many are volunteers in the suburbs.
Don't wait til the last minute- the stores are empty, buy a little bit at a time and build up your inventory.
2) Water- bottled water is cheap, either buy bottled water and store it or use the empty gallon jugs to store tap water (16 drops beach per gallon). At least one gallon per day per adult, 3 day minimum.
3) Food- pasta, sauce, dried food, canned food etc. Comfort food- some crackers, cheese, turkey spam, candy etc is helpful.
Paper plates, cups, mess kit, matches, can opener, plastic knives forks etc. Electric stoves don't work in outages.
4) Light- buy some emergency candles that burn a long time or tea candles and have glasses etc to set them in to avoid a fire. Have a few rechargeable LED flashlights. Have a couple of LED battery lights too for when the rechargeable lights go dead. LED lights don't use as much power as other lights.
5) Radio- I bought an ETON Red Cross AM/FM/Weather solar/hand crank radio for 30 bucks a few years ago. I wasn't impressed... until it became my main source of information for 11 days. Get yourself some type of emergency radio. Cell phone and some way to charge it very important to keep in touch w loved ones etc.
6) Cash- with no power, food and gas stations were cash only. Medicine- weeks supply to be safe. Eyeglasses, important papers in fireproof box for evacuation. Fire extinguisher, Paper and pen/pencil.
6) Sleeping bags, blankets, warm change of clothes, rain coats, personal hygiene etc. Also books, games etc
7) Generator- if you can afford one, do the research and buy one. They are hard to find after the power goes out.
Plenty more on the web but this is a start. Good luck