Here's just a few that have worked well for me over the years.
Fire related.
IMO, the best way to start a fire with wet wood is to take the time & effort to organise kindling into various grades before you light the tinder...
...and use this firelay...
as seen in the video here...
http://www.youtube.com/watch?v=gqW0lmj6lzA
If you use rocks as a perimeter for the fire, some branches supported over the top can be used as a frame for a hot smoker that will prolong the shelf life of any meat taken with you ...
This same rock perimeter can be used to stack wet wood across the fire to speed up the drying process....
The cake cooling rack shown on the righthand side of the above pic also makes a lightweight & usefull grill for the campfire.
A couple of simple tripods & a cross piece makes a very usefull structure that can be used as a clothes drier & a support to get logs off the ground & near the fire so they can start drying out...
A simple way to prepare wood for kindling without tools is to prop one end on a limb and stomp on it with a downward & crossways motion. This will not only break the wood in half, but also spinter the wood into thinner bits for use as kindling as shown here....
http://www.youtube.com/watch?v=928mnpV5M6E
If your going to use bark as kindling, scrapping it with a knife held at right angles will produce finner shavings which are easier to light with a firesteel / mischmetal rod as seen here...
http://www.youtube.com/watch?v=Vv76wzA99N8
The easiest way to break up limbs into smaller sizes for the fire is to use the leverage that can be generated by a forked tree as seen in the video here...
http://www.youtube.com/watch?v=XQEgOwpDXhI
Branches / logs that don't easily break using the forked tree technique can be simply fed onto the fire as they burn...
Water related
A piece of cloth can be used as a simple & course water filter that will remove the bulk of the bigger floaties
...and a 4 litre recycled wine cask bladder with a removable tap makes a light & easily carried portable water container...
...and when stuck in the fork of a tree, effectively gives you water on tap without the need to bend over (which becomes increasingly important when you get older
)
Camp Hygene
Charcoal from the campfire makes a good scourer for cleaning frying pans & billys
...and soap that is put into a recylcled ladies stocking keeps things from sticking to the soap and can easily be hung from a branch to make use easy
Tarp / tent fly tensioning
A post makes an effective tarp / tent fly tensioner. Simply but a strip of bark at the end of the stick to prevent it from puncturing the tarp / fly
That will do from me for now
.
Kind regards
Mick