Some current info here
http://www.aztrail.org/AZT_WaterSources.pdf 36.0 632.7 Trailhead/FR9008A~0.1left/south metal tank 3 tank full; 1 gallon in resupply box 5/4/16 Blankhiker 5/5/16
resupply box behind bushes left of sign
This resupply box is just 5.1 miles off hwy 180 on your way to set the shuttle you could easily drop yourself a couple of gallons water.
Tim