I guess it all depends on what your experience is.. And Tolerances..

As someone who went thru 2 hurricanes here in florida I would say this:

In my jeep when a storm is inbound I prep for 5 days. That means fuel (twin 7 gallon fuel tanks ) , some food, water, etc. Granted, I'm a fed and have to report to work in emergency situations if called on, and there is always (well, almost ) a rudimentary amount of supplies on hand..

In my home I plan on being able to feed, shelter, and provide for myself and a few of my neighbors for a minimum of 2 weeks. This is not "Chez Ritz, or Maxim's" accomodation at all. But it is enough to stay dry, fed, hydrated, protected, and cared for for a while. I have mre's, dried grains, canned fruit, meat, paper and hygene products, etc.

My personal carry is designed for roughly 48 hrs. This is carried in a medium sized "book bag"- actually the USAF black bag. 3 fresh MRE's 2 liters of water, my PSK, knife, water filter, mosquito net, small tarp, hygeine kit, 880 cord, fresh socks and underwear, the standard stuff..

my home kit is much more extensive than either my car or carry kit. I has a lot of construction items in it. Liquid nails, real nails, visquene, hammers, chainsaws, etc, etc..