Inspired by London's recent unpleasantness, Gizmodo recommends six tools to help you survive a riot mob.
They ignore the two most helpful: a large-capacity semiautomatic pistol with a couple extra magazines, and a pair of really good running shoes. Run, run, run, shoot only when continuing to run would be fatal, and then resume running.
A handgun against a dangerous mob is a terrible wager to make, but it's certainly a better mob-preparedness tool than a freakin' Camelbak.
Now, I'll cut them a bit of slack, in that these kinds of spontaneous and sustained episodes of mob violence tend to happen in places that don't allow ordinary subjects to have arms for their defense. I'm sure this is a coincidence.