Seems like a pretty solid list. If you have the water filter, you may not need the extra bottle, there are typically plenty of places to filter water. Other folks may disagree, but both times I went, 1.5 liters got me comfortably between water stops.
The change of clothes and bivy seem excessive to me for a day hike. I've been up there twice and both times I would have cursed the extra weight of those items since I would not have used them. I'd fill their space with more food. Bring plenty of calories. Eat early and often.
With the phone, map, compass, and gps, it seems like you're a little worried about going off trail. It's a very well marked trail. If you leave at a standard time, you'll have plenty of company up there to keep you on track as well.
