Carry water bottles. Have a bladder, its heavy and leaks. Bottles are ~free. Get them from 2L apple juice with wide mouth. Carry Aquafina 1.5L bottles wide mouth. Mutliple. IF one springs a leak no big deal.
Most of you seem to hike where the streams aren't all that cold. Snowmelt. Don't know about you, but trying to fill up a bladder is SLOW.
IF you ever hike in Fall/Winter/Spring when it freezes, said bladder won't do you much good as its hose freezes and boink goes your water source.
IF there is a stream without a lake above it or a trail above it I just drink directly from the stream. Same with snowmelt if its not near where people camp. Yea, I carry some iodine pills otherwise here in the PNW, there is no need to carry lots of water with you unless you are going on a ridge rock climb. Even then only need 3L of water for drinking cooking overnight and morning.
Bladders = heavy but convenient as they all have to have a protective cordura nylon cover over them, but bottles in a huge number of packs are easily accessible without taking pack off. Large packs for the most part this is not true. Packs by McHale/ULA etc one can easily access their water. If you have a pack with front pockets, put a small water bottle in there if you aren't into taking pictures and like to just hike hike hike the miles away. Personally I go for the pictures as memories. Eh, hem screen saver. Why else do I have a 60" plasma screen? Forget movies, PICTURES!
Drink a Liter/QUart or more at begining of your hike. You will need to take a leak later, but won't be stopping for water breaks and you will feel far better when you are hydrated instead of dehydrated.

