I get a catalog periodically that advertises new, sealed-in-the-can, U.S. issue M9A1 gas masks for $20. Over the past couple of years I thought about getting some that I could use as movie props. Can’t get them now!
The thing about them is that even though they were brand new, they were “not for true protection against NBC agents. commercial solvents, or other potentially toxic agents”. I have one that I bought new back around 1981 for use in a film. If the new ones aren’t guaranteed, I doubt this one will work. It’s in it’s gas mask bag in a box around here somewhere.
There’s probably not a lot you can do to protect yourself. The military has “sniffer” units mounted on the back of special humvees so that they can get advanced warning. Not something civilians have. In addition to masks, they also have suits. Remember that some agents can get in through your skin.
As far as basic survival, I have my gun collection. That’s not what it’s for, but an AR-15 can be used as protection in a pinch. I also have REI’s Backpacker First Aid Kit, one in my Jeep and one on my “ditty bag” (I used up a tiny first aid kit on a film set once, and now I carry the bigger one with my slate, tape, and other camera/grip equipment). I also have a compass pouch with some hard candy, a “space blanket”, a firestarter (magnesium), etc. Another bag has more space blankets, instant coffee, candles, and stuff. Of course I have my camping gear – tents, sleeping bags, backpacking stoves, knives, etc.
The most important thing to have is water. Lots of it. You should have at least one gallon per person per day. This is one thing I don’t have, since I drink it instead of saving it.
What about getting out of town? You should have a plan. You should also get out early. The roads will be jammed. Carry extra gasoline. I motorcycle is better for dealing with blocked roads (especially a “dual sport” or Enduro), but you can’t carry as much as in a car. You may also be hassled if you’re carrying an AR-15 strapped across your back.
The best plan is to not be there when the feces hits the rotating oscillator. If you live in a big city, you’re probably screwed. Even if you do get away, if don’t know how to “rough it”, it will be hard. I would avoid people for a couple of reasons: First, they may be infected. The less contact the better. (And if you’re infected, you don’t want to spread it.) Second, some of them might not be community oriented and will try to take your stuff. If you have a place that’s secluded and hard to get to, has a reliable source of water, and so forth, hide. Don’t call attention to yourself. In a true emergency, you’re probably on your own. You may have to kill. In a complete socio-economic collapse, you have to look out for numero uno. Ruthlessly.
Let’s hope we never get to that point.