I will log this trip here, but our actual route went down the Grandview trail across the tonto and up Bright Angel instead of S. Kaibab. We camped at the Western tip of Grapevine canyon on Day 1 and near the Western boundary of Cremation for night 2. Saw a handfull of deer between S. Kaibab and Bright Angel along the tonto, other than that just some pesky ravens at Grapevine.
There was water in Cottonwood Creek, the East side arm before Grapevine, Lonetree and at Pipe/Page springs.
It won't let me put in days for some reason, but it was a 3 day/2 night trip, actual time on trail (hiking and breaks) was 17 hours. I turned the GPS off while at camp. Moving time was a speedy (for me) 11hr 42min.