Get a map and all your questions will be answered as to where the water is.
Everything else depends on the heat, humidity, how you sweat and what your body needs. Figure 16 to 24 oz./hour to stay hydrated.
Me, I carry two liters to Trailside Meadow, then at 4 for the summit round trip to this location. I've needed as few as 3 and as many 5 for the round trip...5 on a day below 40 F in May.
