Maybe give them a call and check if all normal now for camping etc, they can obviously tell you about the bore too.
I found 2 phone entries for Mullorina one from Yellow Pages 08 8675 8341 . . . and one from WIkicamps 08 8648 5300.
I've never done more than travel past their driveway many times, but I believe the camping is reasonable, toilets, bring own drinking water.
A drive to Level Post Bay (if open) is on my list one day, though Lake Eyre South is drying up pretty well.