That's a nice hike. I did the 4-Mile trail to G.P., over to Nevada Falls, and back down on Fathers Day a few years back with my older children. It's about the only hike I know of where you can stop mid-hike and get ice cream and other treats before continuing on.
Only water is at the Illilouette Creek crossing. It's a dry and warm 800' gain to Panorama Pt. The Four-Mile isn't bad, because it is all on a north-facing slope.
Here's a Map
