I’m not sure if you knew but over the weekend there was a wildfire in the SGW and all the trails and wilderness campgrounds in the San Gorgonio wilderness is closed at the moment. The wildfire is at 5% containment. I was actually hiking on the mountain when it happened and had to get to safety when we saw the smoke. I can’t really answer your questions about the water but wanted to let you know that you might have to make plans elsewhere in case the trails are not reopened next week.
I also have a backpacking permit reserved later on this month. Hopefully everything works out and we can get back out there!