u/spookaburra

Planning a little out and back camping trip and was thinking of camping at the end of the Angels windows trail (300 ft off trail and all that), I know there is a little waterfall there, was thinking it'd be a convenient place to fill up on water, while I'm out so I don't have to carry a bunch of water, but wanted to know if sometimes it dries up and to expect there's a chance it could be not flowing?