I parked my car on the west side of the Chino Hills State Park and followed the route to the east and back. Even though most of the east side of the park burnt end of October 2020, all those trails were open to the public. There is some access to water at some point (forgot where it is though), but I had enough with just 4 bottles. I think this park is less known from the LA public in general, but it is worth a visit and some FKT action!
Standard out & back
4h 59m 42s