Steve: thats why I said depending on the pace and rate of consumption - should be easy to estimate after ~8 miles uphill. My 2L breakdown is: 1 on the way up from Iceberg lake or SB22, 0.5 to cook dinner and brew some tea, another 0.25 for breakfast coffee and the rest for a quick descent to the first water source. Done it 3 times, twice on the way to the Valley carrying the full pack w/o resupplies. I realize that most people may want to be more conservative, but most people also tend to carry more than they need. 3L of water is 6.6 LB. The "experts" on Whitney FB pages even preach that everyone should also carry 10 essentials on their TC to TC day trip. Never heard of anyone ever needing extra supplies or repair kit on that hike, not to mention maps, compass, matches and lighters.
