You have to think of it in terms of priorities, and yes I will throw out the "rule of 3s" again. Depending on your environment, the priorities may changes a bit, but you need to think through them. I do conceptualize it in terms of concentric rings. I make sure that I can take care of myself first (in preparedness), then my family, then our close friends and neighbors, then other friends, then the community. If each level is self sufficient for a few days, they will not be likely to need help from the government and they can reach out and help others to be less vulnerable and not need assistance. This worked well in this last hurricane, but we did not get hit really hard in my area.

Have a bag with 3 days worth that you can carry on your back. The non-expendable supplies will last longer than 3 days of course, so you are worried about water and food quantities. Include water purification.

Be able to sustain yourself in your house for a couple of weeks. Do not forget sanitation needs! Smaller water storage containers are better than large ones as they can be moved by one person. There are many options out there for containers of 5 to 8 gallons. Every trip to the grocery store purchase a little extra of canned and dry goods, and store them where you will not be tempted to use them on a daily basis.

Be ready to evacuate. Your vehicle should be fueled if you are expecting trouble. Have the basic necessities to ensure your vehicle stays mobile (tire changes, number cables, etc) and figure out how much your vehicle can carry in terms of quantities of water and food. Maybe some extra comfort for long term, such as sleeping pads, large tent, sanitation. Have an area, or multiple areas in different directions, that will be outside of the danger area for whatever kind of disaster you may be facing, and know how to get there without a GPS.

You may never need these things, but when you do, you really do need them. If you never have needed them, consider yourself lucky. We were ready to house 3 families in our house, but it wasn't needed. Nobody that I assisted in preparing needed to evacuate or found themselves in need due to loss of power. They had what they needed for a few days along with an ability to cook without electricity.

None of this is difficult, and you can do it for less money than you might think. You just need to think ahead, and prepare.