Always make sure the local police or someone reliable Knows where you are going.
Try not to travel in remote areas alone if possible.
In tempreatures over 35 degrees I have drunk up to 6 liters a day, so be prepared.
Just a Warning; A test was done west of Jundah west Queensland by the S.E.S. to see how long a fit man could last in forty degree heat without shelter or water. The guys tongue was swollen and he was beginning to hallucinate after only 2 hours and almost incoherent after 4, he was retreaved at this point.
Carry a personal EPERB, or personal GPS emergancy localion beacon. Flares, a "V" sheet and a morror(polished metal with a hole in the centre won't break and you can easily direct your signal).
Stay with your vehicle.
Be sure you are up to date in the current snake bite first aid and have a complete first aid kit.
UHF radio is essential in remote areas as most areas have a repeater station some where.
Hire a satellite phone if you can afford it.
Two rangers got into trouble and one died in the west Queensland out back left there car, had little water and tried to walk back in the heat of the day, and it was only about 14 klms back to base as far as I understand it.
What did they do wrong? What would you do in that situation?
I'm not asking, these are questions you ask yourself before you go.
If you walk any distance from your camp have a note book and draw a detailed map with landmarks and the dirrection and rout you intend to take. Write on it the time and date you are leaving and when you expect to return.Leave it in a promanent position in your tent/camp.
These are a few things that I used to abide by when prospecting for opal in a very remote location in west Queedsland and I'm still here and had little trouble at all. Be prepared for the worth care scenerio.
Hope this helps with you preperations, there is plenty more to consider like food and shelter, fire ignition etc.