A timely warning

Willem...well said. Never, never, never leave the site of your vehicle. Mush easier to see a large vehicle than a person from the air.

It is wise to carry reflective tape to indicate to a plane your needs ( there is a code like an X means you need rescuing) an epirb is good and of course Satphone or HF if you are going real remote. I think though that heat / panic cause some of these people to lose it, therefore it is critical to stay hydrated and have faith in your skills. Unfortunately most of the deaths seem to be the ill prepared or unskilled.

Most probably know how to get water from those sources but here is a little more detail.

Fit a plastic bag over a leafy branch of the tree and let it capture the water released from the tree through transpiration. More bags on more trees = more water.

Dig a hole place leafy tree branches or brackish water in the hole. Put a container in the centre to capture water, cover with plastic, gladwrap, poly tarp whatever you have and place a stone on top to create a low point over the container. Transpiration / evaporation occurs plastic sheet stops it, droplets form and run to the low point above the container and splash there you have water again.

Stay safe Pete

Just something further on the reflective tape theory, in the marine industry it is compulsary for vessels to carry a "V" Sheet (in NSW).
Basically a sheet of fluro orange tarp with a large "V" in black on it. It is simply displayed to indicate you need assistance.
Most SAR aircraft being from the coast or inland should recognise this as a distress signal.
Tim