Pepper spray. An excellent, temporarily incapacitating weapon - very difficult to resist and capable of buying you just enough time to escape. Works quickly and reliably at distances up to perhaps 10 feet; can also stop some animal attacks. Usually not heavily regulated, making it easy to obtain and carry even in places that frown upon other forms of armed self-defense (but check the laws). Pepper spray becomes less effective in strong wind; there is also some risk of blowback, but this is mitigated in narrow-stream products, such as Sabre Pepper Gel ($18).
While these guides may be made available through Print on Demand services, they're just as likely to be distributed primarily as direct PDF downloads. These get passed around forums, reviewed on survivalist blog networks, and included on "USB survival libraries"—normal USB drives loaded with PDFs of survival books and reference materials. When the guides are being sold directly from the producers, you'll often see them bundled with a few bonus guides (maybe only 15 to 25 pages) with clickbait-flavored listicle-type titles: The 25 Biggest Mistakes That Will Get You Killed When the Shit Hits the Fan. 10 Must-Have Bug-Out Pack Items. The 15 Best Survival Guns for Stockpiling. That sort of thing.
DIY home surgeons will be excited to know epinephrine can actually be used with lidocaine (a numbing agent) to restrict blood vessels for faster wound repair. (Note: Cracked in no way condones performing self-surgery.) When sanitization resources become limited, the speed with which a wound can heal will have a drastic impact on survival rates. The longer a wound stays open and bloody, the more likely you are to get infections. Infections have historically been some of the most deadly and difficult-to-treat medical conditions, and even today they are not always easily survivable.
Read up on the safety rules pertaining to your weekend hobbies and to your daytime job; ask others about their horror stories, too. Be very careful around select power tools, such as chainsaws, table saws, angle grinders, lathes, and nail guns - they have quite a penchant for taking fingers off and eyes out. (Table saws in particular are responsible for about 30,000 serious injuries annually, or about 40% of all workshop accidents.)
There is also a more utilitarian way of looking at it. From an individualistic, survival-focused point of view, the social costs (real or imagined) are basically moot: if you live in a place where guns are readily available to criminals, it's hard to think of a violent confrontation where not owning a firearm would put you at an advantage. There is a body of fairly compelling research showing that defensive gun uses happen in the US at a rate of somewhere between 500,000 and 1,500,000 times a year, with almost all confrontations resolved without firing a single shot. The inherent dangers of owning a firearm are often overstated by gun control advocates, too: unintentional injury or death due to having a gun at home is surprisingly rare.
I also found that I absolutely detest the rating system that Practical Preppers apply at the end of every segment. Not because they may or may not be right about aspects of that individual's preparedness, but becuase they fit that rating into a "box". Many preppers have to think outside the box, due to circumstances, finances, whatever, but the rating system seems to ignore that. In a few cases, even I found it insulting. I know they carried it over into season 2, but I'm hoping that if there is a season 3 that either gets changed or dropped entirely.
No heating in the middle of a particularly nasty winter can be problematic, too - although it's mostly a matter of comfort, not survival. In most places, with robust shelter and adequate clothing, bedding, and food, it's fairly hard to freeze to death at home (but note that the cold may make some infections or medical conditions worse; you may have to worry about frozen water pipes, too). The situation can become a lot more dire if you are on foot in the middle of nowhere, so truly hardcore, wilderness-minded preppers may have something to ponder about; but hauling a sufficient amount of fuel is typically impractical to begin with, so their best bet would be warm clothing, improvised shelter, and the ability to build a fire. We'll talk about that in the section that deals with camping supplies.
Vehicular accidents are depressingly common; while defensive driving can limit your risk, the possibility of injuring another person or causing property damage never really goes away. When you are involved in a car wreck in unclear circumstances, or when your statements do not match the words of another driver, video evidence may be the best way to escape criminal charges or to resolve civil claims.
In arctic or alpine areas, survival kits may have additional cold weather clothing (winter hats and gloves), sleeping bags, chemical "hand warmer" packets, sun glasses/snow goggles, snowshoes, a collapsible shovel, a snare wire for small animals, a frying pan, a camp stove, camp stove fuel, a space blanket, matches, a whistle, a compass, tinder, medical equipment, a flint strike, a wire saw, extra socks and a tent designed for arctic use.