while there is water flowing at switchback (24?), it is often frozen in the morning, on your way up, so no help.
Others replenish their water by adding snow along the way.
But for most, carrying all the water for the day is probably the best maneuver, if you don't know the mountain. Some like 3 quarts, some 4. Some stash a quart near the junction on the west side for the return trip.
Lotta ways to do it. Most wish they'd had more water.
