A radio is good anyway, for keeping up with news reports, and can be a source of entertainment also.

For me a paperback book wouldn't last long enough to be really useful. I read quickly. I try to carry a smart phone with several e-books in it, which I'll read if I have to wait anywhere. The battery won't last forever so in a crisis I'd have to judge whether to use it.

Playing cards are a good idea. I need to check my BoB has a set.