This article has a set of resources (links for downloads) which may teach children how to handle the particular problems which we, as preppers, are "prepping" to deal with.
http://preparednessmama.com/teaching-kids-about-disasters/My personal bias says that you might be cautious about the "Bill Nye the Science Guy" series, but you must decide when you preview any of these resources.
I note that most of the links are through Amazon(r)
and you may be able to locate some of these items on other sites... Do a Non-Google(r) web search on the titles.
One reason I'm advising the use of Non-Google(r) search engines is that your search, with Google(r), will reveal that you are looking for child-related books with a "prepping" orientation. Do you want that information stored in Google's(r) database?
I suggest and recommend using
Startpage.com instead, as your search engine of first choice. It will return search results from the other major search engines (including Google(r) ) but will do so without revealing Your personal information. It is an Meta-Search Engine.