Do you carry emergency rations when you travel in the outback? I suggest that if you do not, you should. You must be self sufficient and cover potential problems and that includes a vehicle break down in remote areas. With modern technology you may consider this unlikely. However, this is not the only reason as weather may trap you; consider heavy rain on unmade roads in black soil country. I know of one case where a family was stuck for a week. Luckily they were prepared with sufficient food.
A supply of tinned food is probably the easiest to carry, preferable to any item carried in glass that is prone to breakage. It is possible in this day and age to obtain a great variety of different foodstuffs. Nothing is more boring than eating the same food for three meals a day. Dehydrated vegetable that only require boiling water are another possibility and take up little space. You might also add to this list such items as matches and fire lighters, they just might be invaluable if and when the time comes. Keep these valuable items in something that is completely waterproof.
It’s probably best to contain such items in a specific box. We rotate all such items every couple of trips, it freshens the stock up and allows inspection to insure nothing has developed a leak; they tend to be bounced around a bit on unmade roads. Oh yes, and don’t forget the can opener!