Bush Craft
The following document should be considered a baseline for all your outback activities: WA Police - Bush Survival Manual.
If you don't want to print off the 120 pages of the WA Police Bush Survival Manual but still want a hard copy in your car then the SAS Survival Handbook may be just the thing.
Whereas the WA Police Bush Survival Manual includes Vehicle and Trip Preparation, West Australian specifics and Bush Craft, the highly regarded SAS Survival Handbook by John 'Lofty' Wiseman, focus more specifically on survival. This is available from most book store chains as well as Amazon.