Hi Luke,
It's fantastic country. I suggest to start your off-track adventures by doing the walks from Ormiston Gorge to Bowmans Gap and to Mt Giles. There's plenty of water at Bowmans Gap (south and north ends). The north end is the prettier campsite, but be sure to go all the way up the creak that heads east from the south end, to visit the dramatic Canyon of the Thirteen Pools.
For Mt Giles, there is a spring at grid reference 782829 which is more palatable than what's currently in Ormiston Creek.
The Park information sheet gives more details on these walks:
https://nt.gov.au/__data/assets/pdf_fil ... -sheet.pdfFrom the base of Mt Giles, you can continue east to Giles Yard Spring, which has reliable water at grid reference 855834. From there it takes a full day to head generally south across to Pioneer Pass and meet the Larapinta Trail a little bit west of Inarlanga Pass, to exit at Ochre Pits or Serpentine Chalet. However, I would normally prefer to return to Ormiston Gorge.
If the transport operators are booked out, you can rent a car and leave it at Ormiston Gorge. I have done this quite a few times, with a note on the dashboard saying "Bushwalking Until <date>", and I have never had a problem.
I would give some more details, but I'm about to head off on a 14-day trip from Hugh Gorge to Mt Razorback. This area is like a drug - I started with Bowmans Gap and Mt Giles too.
Free topographic maps are downloadable from here:
https://ecat.ga.gov.au/geonetwork/srv/e ... data/68386For electronic navigation, there is a paid Larapinta map for the Avenza mapping app which also covers Mt Giles and Bowmans Gap.