Bandanna - you need something to blow your nose on, do you think you can still buy Kleenex afterwards; also makes decent bandage - I have had to wrap injuries with them occasionally when camping or working at landscaping.

Aluminum foil - you can cook in it; you can wrap stuff in it, but you can do that with plastic; save the foil for stuff where other things won't work.

Chlorine bleach can disinfect first aid stuff that gets dirty, but more importantly it can disinfect water supplies - it isn't as good as iodine, but it is good enough, cheaper, and if you buy much iodine suitable for disinfecting water, nowadays you are liable to have a midnight interview with some vicious twits looking for your meth lab.

With regard to the bandanna, one of the things I learned repeatedly through hard experience at Burning Man is that you never leave your dust mask behind. In the last few years, I've had a number of times when I wished I'd not forgotten that lesson: when I was in Riobamba when Tungurahua erupted, when the irritating smoke from the burning fields enveloped Buenos Aires, and an occasion while traveling in December when I was subjected to an involuntary mosquito-fogging. I imagine the protestors and bystanders in Cairo wished they had dust masks, too.

Obviously in most of these cases there are still particles too small to be stopped by a dust mask (or, especially, a bandanna), and of course many fires produce gaseous poisons much worse than mere particulates, but it still makes a real difference.

Its ok, you will find out during the emergency - "hey! I have to sterilize this sewing kit before I sew up Jimmy! Anybody got some bleach?"

care to speculate?

bandana: if it's large enough, it can be a sling for an injured arm

aluminium foil: it's reflective, it's a heat isolator, you can wrap stuff in it

bleach: to disinfect utensils

What's the chewing gum for? To keep the kids quiet?