I'm a pansy-ass city dweller, but I've lived through two major earthquakes and their respective aftermaths (Loma Prieta in '89; Northridge in '94), during which there were significant disruptions in supply chains and utilities/sanitation, so I'll throw in my Pansy-ass City-dweller Doom Prepper Lite advice.
I've previously made other comments in which I recommended always keeping extra non-perishable food and basic cleaning and hygienic supplies on hand--stuff you already eat/use on a regular basis, just more of it. I keep my food stash rotated, so none of it has a chance to get old. My priority has always been foods that can be eaten with no or minimal cooking/heating, because it's just fucking easier that way. And forget doing dishes; paper plates/bowls are the way to go, and keeping a stash of them in the back of a cupboard is worth it.
In my own case, as a single person with no kids but a shitload of cats, I've always tried to keep enough food on hand to keep myself decently fed for a month, and the animals fed for two months. My reasoning behind that is that in a truly massive catastrophe, providing human food aid is likely to be a priority, but pet food isn't.
That's actually far more supplies than I've ever needed; after both earthquakes the supermarkets were able to restock very soon. But I will tell you this: when the shit hits the fan, knowing you're totally covered as far as keeping yourself and any dependents fed takes a HUGE weight off your mind. There will be a lot of shit to deal with in the days and weeks to come, and having that one basic thing covered gives you the brainspace to focus on other matters. And while telling other people, "Oh, hey, I'm totally set and have
tons of food on hand!" is a bad idea, being able to give a bit of extra food you've "scrounged up" to a hungry neighbor during a crisis is a good thing.
What I don't have: lots of bulk dry ingredients or an extra freezer full of food. If the power goes out, a freezer is useless. Rice? Lentils? You've got to cook that shit, which requires a safe environment in which to do it, a safe heat source, clean water to cook it in, and water to wash the pot afterward. Cooking them takes time and attention which may be better directed toward other matters. Fuck that; I can eat refried beans, chili, or tuna straight from the cans, with crackers, for days or weeks on end and be content with it. Such is the power of my autism.
Repeat after Uncle Johnny: Nobody is going to come save you. Nobody is coming to help. You are on your own.
So, make sure you have water. Recommended is 2 liters of water a day. You can go shorter if you don't move much, but if you are mobile and active, two is a safe bet.When I was in the Gulf I once had to make a canteen last three days. Spoiler, I drank my own piss on Day Three. Why? Because I wanted to fucking live, just like you do now, so let's avoid having to drink out own piss, shall we, boys?
You need 8, 8oz bottles per day. Let's go with:
Wal-Mart
That's a 40 pack of 16 oz bottles. That gives you 4 per day, for 10 days. You need 3 per person in your family if you go bare bones. (I personally would go 6, but I'm a turbo-sped about this plus you can use it for cooking, which is something EVERYONE seems to forget when doing their water consumption estimates)
I buy Crystal Geyser bottled water in gallon jugs, and have two dozen jugs on hand at all times. They're only a buck apiece, and the empty jugs can be used to go get fresh drinking/washing water from another source, should it come to that. As with food, I rotate my water supply, using one jug a month and replacing it with a fresh one, writing the purchase date on the cap with a Sharpie. I've got a dozen empty jugs hanging on a rope in my garage, plus a couple of five-gallon plastic water-cooler jugs I scavenged, and those can all be filled from the hose right after an earthquake and used as bathing/washing water. If I need a smaller vessel to carry water, I'm like every other resident of my eco-conscious, evangelical-progressive city in that I have more reuseable plastic water bottles than I know what to do with. So I'm set.
I also recommend, if you have the money for it, the following:
Lemon Concentrate (Adds flavor to water and can be used in cooking)
Mio/Extracts (Flavored water/Popsicles)
Lime concentrate (Adds flavor AND avoids scurvy)
Coffee (Tastes great AND has caffeine, also a good trade good to soldiers)
I've always got a couple of cases of sugar-free Monster on hand, but if it's just caffeine I need to stay awake? I've got a jar of 200mg caffeine capsules. Taken with 200mg of l-theanine, the jitters are pretty much nonexistent.
Now, you're going to need something. We're assuming 45-60 days of "I'm from the government, I'm not here to help" going down. We'll also need to consider power, water, sewage, cable, internet failing.[...]
If you can afford it, a chemical toilet. If not, well, listen close to Crazy Uncle Johnny. First of all, your prep.[...]
I lived in San Francisco during the quake in '89, and while electricity was back on within 72 hours in my neighborhood, and we still had water, the sewer line from my building out to the street collapsed, backing up sewage into the basement. Man, I was glad to live on the fourth/top floor, because some motherfuckers were dumb enough to keep flushing their toilets even after it became apparent there was a problem, adding to the mess in the basement--and the ever-growing miasma on the lower floors. It got really dire by the end of the first week, and didn't get cleaned up and repaired for nearly three months post-quake, during which I moved out. But for the short time I remained I did at least get the toilet situation figured out.
As you said, I shut off the water, emptied the toilet, and lined it with doubled-up kitchen-sized trash bags (because no way was I risking the failure of one bag). But I only used the bag in the toilet for shit. For pee, I used a 2-gallon bucket with a lid, which I carried downstairs and dumped into the storm drain at least once a day. (I was not the only person in my building doing this.) Anyway, with poop, I simply covered it with cat litter. I had just bought a new 25lb bag of Jonny Cat the day before the quake, and still had part of the previous bag left; things would have got ugly quick without it. The litter covered the poop and acted as a desiccant; the stink wasn't all that bad because I wasn't adding pee to the mix. I could get away with replacing the bag every other day, and I threw the used one in the dumpster downstairs (which ended up being another nightmare because garbage pickup fell way behind schedule).
All right, you're wondering about how you're going to cook.
Buy the old "home on the range" percolating tin coffee pot. Buy 2. Also buy coffee filters, because you can use them to filter water from debris (not chemical contamination) and works good for rainwater.
Being a cityfag lefty, I already have a French press for coffee, and an immersion heater that plugs into my car's cigarette lighter so I can quickly boil just enough water to fill it. I'm on the road a lot, and that little water heater has saved me from so much shitty gas-station coffee; it's also made coffee possible on a few mornings at home when we've had blackouts due to high winds knocking trees into power lines.
Oh, and hey, one more thing--it's always a good idea to keep emergency cash stashed away, just in case power goes down (even if it's just for a day or two, such as after severe weather). But if you decide to do that, include a lot of small bills. You may need to buy something off somebody else that they only want a few Freedom Shekels for, and if all you have is twenties, and they don't have enough cash on them to give you change, it's a pain in the ass. Or if you get into a store and their cash registers and credit card processing system is down along with the lights, you can still make purchases. So keep lots of $1 and $5 bills and a few $10s, rather than a bunch of $20s.