Piston or Turbine?
The Musgrave roadhouse is a good place to get fuel on the peninsula. The drums lying around there all belong to different pilots/companies, not the roadhouse, but you should be able to get in touch with the owners if you call the roadhouse a few weeks in advance. Most of it is 100LL but there might be some JET-A as well. Apparently there is also a truck that delivers/fills drums on a fairly regular basis. Although the roads might still be a bit wet.