On survival thinking, don't worry about food, it is low on the list and going a day or two without food is a nothing.. I went for years and years and never carried water, depending on finding some in the area I was in. After a trip or two, you will see how much water you can find, or maybe you will have to carry some.
I will present here a very common occurrence that can kill you over one night. It is late fall, weather just above freezing, it clouds over in the afternoon and rains, getting you soaking wet. The rainy weather confuses your time and directions, you wonder if you are going to make it out of the bush, so you hurry more and work up a great sweat.
The storm moves on and the temperature gets below freezing over night.
If you have to spend this night in the bush, you will be dead by morning, unless you get a good fire going, get warm and your clothes dried out.
Thus, reliable fire starter, waterproof matches in a closed little jar, with some cloth that has been soaked in warm paraffin, stuffed in the jar.
The most important tool you can carry is a small, sharp hand axe.
The most important information you can learn, is how to start a fire in a wet bush.
