I would suggest some classics for bushcraft books.

Kephart

http://www.amazon.com/Our-Southern-Highl...5785&sr=1-2

http://www.amazon.com/Camping-Woodcraft-...5785&sr=1-1

http://www.amazon.com/Captives-Among-Ind...173&sr=1-20

Nessmuk

http://www.amazon.com/Woodcraft-Camping-...5785&sr=1-6

But your daughters might like a tent if you bought one.

http://www.amazon.com/s/ref=nb_ss_t_4_5?url=search-alias%3Dtoys-and-games&field-keywords=play+tent&sprefix=play+
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May set off to explore without any sense of direction or how to return.