Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
If the car is still under any form of warranty, then the warranty should cover your tow cost to the nearest dealer.
If not, then at least let it cool down gradually, add some water to the coolant reservoir higher than max, leave the bonnet up, start the engine and see if your can locate the leak by eye.
I would then have it towed to the nearest repairer to where you are now.
Hopefully the engine has not suffered any damage.
Hope this helps.
It may be something simple that a local guy can do a repair to get you going, and may save you an expensive tow fee.
Do you have a mechanical workshop near you, that may be able to look at it tomorrow?
A cooling system has many places to fail from, it could be an easy fix, even temperary to get you going, or could be fairly major.
I hope my advice has been of assistance to you.
Wishing you all the best.