Russell Lang wrote:

Doen the east coast you shouldn't have a problem finding a suitable
shop every 50km. Many towns with a population 1000 would have a
general store. Crossing the Nullabor form Adelaide to Perth is a different
story. Check guidebooks for the interval there, but I guess it is 100 -
200km.

Distance between services on the Nullarbor averages around 150 km, longest
being Norseman to Balladonia at 198 km. Expect water to be available only in
bottles at $3-$4 for 600 ml. Fizzy drinks are cheaper. Camping facilities
are around $10 a night and include a shower in non-potable water.

Theo