You can pull through the gate all the way up to the trail head. the only water available right now (June) is within 2 miles of the trail head, both coming and going.

the trail map in AllTrails is also wrong, at the 2nd final big turn that brings you back to the trail head. just stay on the trail even though it doesn't match AllTrails at that place. and the mileage ends up being over 11 miles.