We just got back from a great summit yesterday and there was plenty of water even above trailcamp. The water as notated in the orientation notes for whitney first timers in the feature topics section of this board is accurate(go to whitney water, it shows a complete list of each spot for water). The water above trailcamp was still flowing nicely at switchback 23 but above that there is nothing so plan for at least 2 litres if its warm out. I had plenty of water using a 2 litre hydration pack but had to donate a litre of my emerg filter bottle to one of my friends who didnt bring enough after 23. The weather was great up there, clouds didnt come in until about 2:30 pm. Have fun