The advice regarding water is correct. I came back from Kings Canyon/Uluru to Queensland via South Australia about two weeks ago. The temperatures were 40deg and getting hotter. Your personal water needs will be high. Take sufficient water for a day plus some in case you get stuck. Keep your body covered as you will get sunburned quickly.
Keep an eye on the weather. If the rains come early it will be a problem for you.
Have a good trip, be safe and I hope the DR has a large tank.
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