Ponation - take this with a grain of salt but had similar situation coming from essentially sea level - 340ft.
Day 0: drove to Mammoth, stayed night motel, it was Bluesapaloosa weekend, still not sure why people feel compelled to scream and yell from midnight to 2am.
Day 1: hiked around Devils Postpile couple miles, elevation 7500ft'ish; drove down to Bishop Creek/South Lake/Willows campground for 2 nights. Campground nearly empty (1 other party there) seems heavy rains prior days washed others down the mountain, unfortunately the mosquitos stayed put and made there presence known. Short hikes to and around parts of Long Lake est. 5 miles, elevation 9700-10750ish.
Day 2: drove down to Lone Pine stayed at DowVilla
Day 3: hiked to Trail Camp (no discernible effects of altitude)
Day 4: Summit and return to portal. Overall, no bad effects from altitude, other than very mild headache from summit down to trail crest at which time took 3 motrin (a beer would have preferable).
Even with the advice and info from this forum about eating/snacks I did not eat very much summit day. Appetite diminished which may have effected energy level for decent. Pleasantly surprised by amount of water/springs on switchbacks, I had maybe a 1/2 liter from trail camp until I decided to fill up (multiple switchbacks to choose from and just tried to go as high as possible without needing to backtrack for last one). For me 3 liters from trail camp to summit and back was right on target.
Note, before Whitney hike my wife and 9 yr-old daughter were with me so dialed back some distance and elevation pre-trip conditioning that I may have otherwise done. But nevertheless was adequate for me on this day.
