Adrian is right, there are alot of posts on this trip alone. Wifey and I did it last year.
http://www.whitneyportalstore.com/forum/ubbthreads.php?ubb=showflat&Number=65954And i did alot of research including my own Question Thread:
http://www.whitneyportalstore.com/forum/ubbthreads.php?ubb=showflat&Number=62309We made it to Soldier Lake on day 1 which is 10.5 miles - plenty of water there. I don't remember if there was any water between Horshoe & There, but i want to say there was. We also skipped the Army Passes and went around via Cottonwood Pass. I think this added a few, but was the lesser of (3??) evils.
We summited on 3 day like you want, but we took out packs to the Trail Crest and left them there. We summited, then returned on the Main Trail (picked packs back up at Trail Crest) and stayed at Trail Camp on 3rd night, returned on 4th. We took shuttle/taxi at the start of our trip out to Horshoe, so our car was waiting at the Portal. Definitely worth the bucks to do the shuttle.
If i recall the mileages, getting back to Sky Blue Lake after summiting is doable, but will be a long day, then you have another long day to get from Sky Blue all the way back to Horshoe. Getting out of Crabtree is a haul, going up the side of the Scree. I have some pics in my album referenced in the TR.
Probably could be done, but turns into long days/hikes on the return. It's a beautiful route though and I recommend it!!