Cheers for the comments guys!
The trip was done by Calypso Star Charters, it cost us $500AUS for the day. The whiskey was a bottle of 10 year old Jamesons. And if your going south across the Eyre Highway then you don't need a 4x4, its all sealed road, we did it in a late model hilux that is 2 wheel drive. Although if we did have one it wold have made more areas accessible!