It really depends on where your traveling but the most important things to take regardless of spares for the car are: Fresh water, emergency rations, first aid kit and emergency communication. 
With water it is a good idea never to fill you washer bottle with any additives, keep it for water; in an emergency it's another source. Also in northern clim's work on at least 10L per person per day. With rations I do up a "ration pack (spam, crackers things that last and don't go off, but taste bloody horrible) and put it in a palstic sealed box under the seat. 
First aid kit, get it from Rural Ambulance in Vic or St Johns and don't skimp on it. Also get some basic first aid training. 
For emergency com's get an EPIRB. Ignore the issue of which frequency as the units usually need an inspection every 5 years to renew the battery (just in case) and by then the new frequency units may be readily available. The other thing is a SatPhone, much easier to explain to everyone in the group how to use than an HF as there aren't many kids or adults who can't use a mobile nowdays. Get some dyno tape and put the phone number, pin number and emergency number on the side of the phone.
A UHF is also handy (mainly for vehicle to vehicle) but in remote areas there are still not a lot of repeaters (except SA).
				
			 
			
		 
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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