Days of food at home absolutely. Some water containers ready to go yes. Some heating source either alcohol or gas bottles, reasonable and not big investments.

Going to weeks or months start to be reach.

And beyond that, what are you expecting to come back to? Subsistence farming? That is a very large step up... And well then you have lot of people to compete with. If we are talking about total systemic collapse, well that is very complex mess to prepare for.

On other side large scale wars, well probably some support will come relatively quickly.

Two weeks of food shouldn't be hard for most people on this forum. There's a lot of people whose financial situation is so permanently on edge that they can't do that kind of preparation for a healthy balance diet*, but for everyone here, two weeks should be fine.

IIRC, Mormons store a few months stockpile as standard.

* For an unhealthy diet, my university meal planning for a significant fraction of each semester was two large bowls of cereal in the morning and ramen noodles for dinner. I didn't realise how far below my caloric requirements that was until comments on this forum many years later. But that cost 50p/day in the UK in 2004, and if you're consuming 500ml of UHT milk/person/day then the six litre multipack one person can lug up a hill with no car will last 12 days before needing replacement, while dried grains and cereals like oats, rice, etc. are even easier to stockpile.

Given the relative practicality of disruptions of various types there were a ton of sensible things you could do for a few hundred dollars that weren’t really wasted money anyway. You didn’t need to fill rooms and load up on the automatic weapons and ammunition.