回复："3 restrooms in the first half" ---so, there's no restroom

No more restroom. The restroom in Little Yosemite Valley is the last one.

I would not carry and eat that much so that I will have leftover to pass out after the first half :-)

Just kidding! No.2 is easy to solve, we have the vast nature and away from water source. No.1, on theory, you have to pack it up and bring back to dispose it properly.