by AlmostThere » Fri Jun 14, 2013 6:41 am
You have to carry your water or bring a filter and treat water from the river to refill. You'll need to be drinking a liter for every two hours of hiking, so I suggest a filter to obtain more before leaving the river for the last time at Little Yosemite.
The backpacker campground is near North Pines, the ranger will tell you where it is. You will be required to camp in Little Yosemite Valley in the designated area, or, to be 2 trail miles from Little Yosemite Valley before camping, while you are backpacking - this too is pretty clearly marked and the ranger can show you on the map.