If you haven’t already, I recommend having a supply of canned beans, canned tuna, canned meats to preference, canned sardines, bulk rice (you can drop dry ice in a 5 gallon container and fill it with rice, then put silica packets on top, then seal it). With that, you can eat pretty good limited only by the duration being prepared for, and it is relatively cheap & space efficient.
For water, buy a Sawyer filter. I like the squeeze. They are capable of removing most harmful organisms out of the water, are very portable, and would help a lot during a water supply issue. They do not filter chemicals or dissolved solids. I use mine when backpacking to drink out of just about every fresh water source you can imagine, and I use it when traveling to other countries with questionable water supplies.
Also, do yourself a favor and buy a bidet seat. These will change your life. Not only is it more hygienic, it reduces the use of toilet paper significantly. In the event of disaster but water is still flowing, that is one less thing to think about.
For warmth, have the layers available. A wool base layer can keep you warm in even the coldest climates. Do not use cotton; cotton is deadly when wet in cold. Wool insulates even when wet — this is commonly known but I have actually tested it with wool socks walking around in the Virgin river in Zion National Park during the height of winter, among other places. Also would want an insulated windbreaker that can be removed as needed. Warm clothing / blankets / etc is more reliable than a fuel source for heating in my opinion, because you could get snowed in and cut off from the fuel.
These are not actions reserved for just preppers. I think everyone should have this kind of basic readiness on some level. No one in the US, for instance, has any excuse because it is all very very affordable, and also contribute positively to the environment in the case of a bidet seat.
If I was in the position most of you are in (I have opted out of the housing market for ethical reasons), I’d also be powered mostly via solar and a 3 day reserve battery for the house. Expensive, but worth it. All my heating and cooling would be electrical and I would have an inductive stovetop. Everything electrified. It is a privilege to have that kind of prep but it has a dual purpose of not hurting the environment.
When I am in the wild, I do not like to carry anything that is singular purpose. Everything must have multiple uses. This reduces waste and increases efficiency in many ways. Likewise, for disaster readiness, you need to tweak the way you live normally to be efficient during disaster. A bidet seat, for instance, is a good example. This makes your life more efficient, more comfortable, and reduces waste. Simultaneously, it functions much better during disaster.
Food storage can also be done similarly. Store things you would actually eat but preserve well. Rotate the storage by actually using it; this lets you keep track of what is still good and integrates it into your diet realistically.
Water filters can be used while hiking. Use them. Go on a hike and take a drink from your rivers or lakes. It is refreshing. If your rivers and lakes have dangerous chemicals dissolved in it because of human activity, don’t you think something should be done about that?
Aim for at least dual purpose in things. Readiness should function without the survival aspect and flow into survival without friction.