Missed the edit- 2 weeks 3 days is extremely optimistic, IMHO, having seen stores in the 2 days preceding hurricane landfall…
Hell, modern grocery stores stock 20 minutes ahead, if that. Stop the trucks that keep them supplied and the shelves will be bare in less than a day. Rioting will begin shortly thereafter.
Bricker, if we happen to be in the same place at the same time when The End hits, I’ll partner with you in a second. Most of my military theory and practice comes from war games, but I understand the basics well enough to slaughter the English Department in paintball. 
I wouldn’t be useful, really; I don’t know how to farm, make butter, weave or anything (though clothes would surely not be an issue for a very long time if you’re in a town). I wear glasses, but that’s probably not a big deal for many years also, in a town. (I also have asthma, but it’s not bad, and funnily enough my dietary problems wouldn’t be such a big deal, since it’s mainly wheat and we’d end up eating food that was not gluten-based).
However, I’m fairly physically fit, don’t panic easily, am reasonably good with first aid and medical knowledge, can put up shelves, cook well, and care for animals, and would learn other things reasonably quickly. Plus, my daughter is one of the healthiest people ever and does have a fair few survival skills for a twelve-year-old, so you’d have to keep me around for her.
However, dump me in an unknown city with only the clothes I’m wearing, and I’d be better able to survive than many people.
Right. I only hike well traveled trails when by myself. I get more adventurous when there’s two of us. And, I am a bit of a survival “expert” having taken several classes by well known real experts, including survival trips. I always carry a decent survival kit, even on day hikes. Even with all that, I am loath to go into the bush by myself- I can easily trip and turn a ankle, and it would be a boring and painful 2 days or so until I was rescued. Yes, I’d be OK, unless I was badly hurt, but why risk it?
Well, not that bad. After we get rid of the dudes who panic or go into shock(or actually they get rid of themselves), I think half the rest could be molded into a decent group. And, book knowledge or no, it’s hard to tell if you are going to be one of the ones that collapse.
Having grown up near the ocean, I think I’m in pretty good shape…near the ocean. I’m screwed in a forest though. Fishing, fire, scavenging, growing plants, cooking, making potable water, and first aid I can do. I dunno why Tom Hanks had such a hard time making fire in the movie. I would go with a piece of glass and sunlight. Oh, and just before the apocalypse hits, I would download instructions on making prison booze, moonshine and homebrew beer.
Being on a boat would be a nice way to ride out the chaos, actually. A decent size cabin cruiser or sailboat stocked to the gunwales with provisions would give you quite a few options. Load up the boat, board your crew, and head off-shore until the ugly lessens. With a listen to the radio you could tell where things have started to calm down, and could steer for safer shores.
I made a pork loin chop for dinner tonight. Yes, this is relevant. The cut had some fat on it, and I remembered how my grandparents used to take scraps of fat and render it for both cooking and eating. I’ll save bacon grease for cooking, but I don’t save hamburger grease as my grandparents did. For one thing, I buy a much leaner grind than they used to. When I was younger and poorer, though, I used to cut the fat off of round steaks and chuck roasts and render it and use it for cooking grease. And I still know how to do this sort of thing, for any kind of meat. I cut the fat off from the openings of whole chickens, chop it up, mix it with herbs, and insert it between the skin and meat of the chicken breast. Fancier cooks use butter for this, but chicken fat is tasty and free.
My point is, I could probably teach survival cooking for a few weeks before I kicked the bucket from not having an insulin source. I can scavenge calories from sources that most people today overlook, because I lived with my grandparents for a while, and THEY grew up during the Great Depression of the 1930s. I can also butcher, or help butcher, animals up to deer size…and I’m better at it than my husband Nimrod, even though he’s significantly stronger than I am.
Hell, I still save the grease - in different sealed cans for each pok and beef. My wife thinks I’m a bit nuts, but there’s nothing like beef tallow for maintaining, curing or re-curing a cast iron pan. And bacon grease tastes good when used in a LOT of foods. 