I find these components to be most useful, and customized to my needs. you may wish to change a few things. I feel also that this is better than most commercially available ones. that said you could use a fair few of the things that come in those. and this is also just an opinion, so don't blame me if you get into trouble and it doesn't work for you.
it worked for me when i got lost in the new forest, which is a huge field and woodland area. in the end we walked our way out. 40 miles in 2 days. this kit worked for me so i thought i would share.
Step 1: The first thing may be the hardest thing to get!
that said once you have one your in business so to speak. i have photos of most things how ever not all of them, but i shall right them down as well. and i shall explain how to use these things, and my reasoning for including them. and what to do with them in the field.
Step 2: What goes in it
needles and thread
pencil (half of one or one of those small ikea ones that everyone steals)
broken up CD.
fire steels. (light my fire ones are best)
variety of hooks.
things not pictured - because either I don't have or couldn't be bothered to go and find.
water purification tablets, a good idea
condoms - 2 or three should do. (not incase you get lucky!)