What I did earlier this week was carry a full 1L Smart Water bottle, 2 full 700ml Smart Water bottles, and an empty 2L Platypus reservoir from the trailhead to Trailside Meadow.
The 700ml bottles were empty by Trailside Meadow, where I collected water in the empty reservoir, filtered enough water to refill the 700ml bottles, filled the 2L reservoir, then carried the 4.4 liters of water (some filtered, some not) to the summit. At the summit I did some more filtering and refilling of the 700ml bottles.
I don't think I ever drank from the 1L bottle during this hike, but on my first hike a couple years ago I drank 4 liters of water from Trail Camp to the summit and back and had run out before hitting the switchback water sources on the way down.
I like refilling at Trailside Meadow because it's right off the trail, and the water is flowing well so it's easy to fill up your reservoir.
I didn't check the inlet at the Trail Camp pond (which is a bit of a detour from the main trail), and while there was water at the switchback sources, it would not have been as easy to collect water there.
Anyway, there is no need to carry a ton of water from the trail head to Trail Camp. Have a great trip!
