We used hospital saline solution bottles.  One liter each, and with a nice carabiner tab on the bottom, these bottle are the cat's meow (if you can get 'em).  200 liters of water (about 50 gallons) left the ground with us.  The weather was unseasonably cold the entire climb, so we poured at least half of it out as we ascended. Wow, we look so 70's in this shot--even though it was 82!