> and there is even a map of available water stops somewhere on this site
Here you go... (buried in this thread.)

Water sources: Main Trail and Mountaineer's Route, includes maps:

Originally Posted By: Bob R
Here are the places where you can reliably get water along the main Mt. Whitney trail. Accompanying pictures, to help locate the sights as you pass them on the ascent, are here.

Analogous information for the North Fork of Lone Pine Creek has pictures here.