There are definitely a few sections you want extra capacity. And maybe moreso for you in fall when things are drier, and with new trail construction that bypasses Patagonia and Sonoita. I brought a 6L dromedary plus a couple 1L or 1.5L smart water bottles. Only filled the dromedary completely twice. Once between Kentucky camp and Tucson when it was low 90s and the other between Oracle and Freeman Rd (also hot, minimal water sources). You can get away with carrying less if you're willing to filter from cattle tanks but those can get pretty nasty. Most of the way you can get by without carrying a ton but you need to do your research on reliable fill up spots and resupply locations/hours. There are public water caches along the trail that are stocked but mtbers are asked not to rely on them since we can normally get from one tap to the next without issue. Hikers on the other hand can't travel fast enough and have to rely on those caches. The only one it was accepted for bikepackers to use was Freeman Rd. A water collector was recently installed there which should provide reliable supply. Another one was installed a couple years back between Kelvin and Picketpost.
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