A long time ago I read a book about Alaska. I forget the particulars, but it involved a brother and a sister lost in the Alaskan wilderness. They talked a lot about wax-covered matches.
You might be thinking of Cold River by William Judson about a brother and sister who have to survive in the Adirondack Mountains after their father dies of a heart attack.
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It was made into a 1981 film.
I'm tentatively going with that one, though it's annoying that Google Books doesn't have a preview.
Amazon has some pretty lengthy excerpts available for it.