Sometimes the water faucets at Boulder Oaks are on. Just because one faucet doesn't work doesn't mean none of them work. If there's no water, there's a creek after you cross the road, just follow the drainage. If it were spring, you could backtrack a short distance and find another creek...I prefer this creek if I'm passing through and want to rest at Boulder Oaks.
A couple miles after you cross under the freeway, you'll see a creek bed below.
Shortly after that creek bed you'll cross another asphalt road, and then two miles later you get to a dirt road and can walk down to Cibbets Flat Campground and get water from the faucets there. There is a creek just before the dirt road and at the dirt road, but it's unlikely to have water right now.
Just before you climb into the trees, you'll get to a fork of sorts. If you follow the path/road to the left, you can get to a cattle trough with a pipe spring. I doubt it'll have water at this time of year though.
About a mile before you get to the Desert View Picnic Area at Mount Laguna, look to the left up the rise for a couple of metal benches. You can go up there to the campground and should find water if the campground is still open. A little afterwards there's a drinking fountain on the trail, and you can again go left into the campground. After that comes the aforementioned picnic area and Mount Laguna.
Halfmile's PCT maps have this info too.
I wouldn't count on any creeks for a few more months.