You don't need "survival food" for a natural disaster you need calories and foodstuffs you will use anyway in case there is panic buying at your local store.
If it's so bad that you can't figure out how to get water boiling most people are already dead.
Your comment is dumb because few people are talking end times prepping here, this is basic natural disaster 'trapped in your home for days to weeks' shit.
Prepping is a series of steps, starting with being ready to shelter in place. Realistically, in a disaster, most people will be trapped at home for a short period. If you are stuck without basic necessities, you won't be able to do much afterwards. Prepping for anything beyond that is probably a waste of time and money.
And yet, some of us feel compelled to go beyond the basics.
Once you have a good setup where you live, the next step is to have the means to travel. I have 3 go bags buried in the vicinity of where I live, each has enough supplies to get me through a couple weeks at 1000 calories a day. Have been maintaining them for the last 15 years, some stuff happened earlier in life so being ready to go is important to me. They're just something I check in on every 6 months, test / rotate supplies, make sure nothing has expired.
Being able to travel means you need a place to go. I have an A list, B list and C list of places, depending on what happens I have options. For each location, I know the route to get there hiking and driving. There's a hand-held low-light Garmin device along with solar charger in each bag so I don't get lost. I've been to every place on my list within the last 2 years to check what's changed, and I know the buildings I'd use to hole up if necessary.
One of the things I keep on a map is junkyards, it's usually possible to find a junker that can be made to drive again if necessary. They're also a great source of materials for improvised tools, slingshots are more effective for hunting when you are firing lug nuts. Another thing I keep on a map is a list of breweries, there's research showing bars / restaurants / sources of booze are natural locations for people to congregate during emergencies. Depending on the situation, I can make a decision on whether to approach or avoid. Another map I keep is a list of food distribution centers for supermarket chains, the warehouses where they keep canned food. Not that many people are going to know where those are located, the odds of scavenging are better in a place like that.
Where I live, it would be stupid to build a bunker. If supplies were seriously interrupted, the city would be out of food in about 5 days. No one prepares, there's a lot of condos and high density housing that would put serious strains on existing stocks. Looters don't concern me much because it's mostly liberal faggots, it's more what kind of restrictions they would want to impose after a disaster occurs. Everyone would be safer if I just left town, and I'm fine with that.