At the height of the drought there was no water within the forest by us for a good ten square miles. The only water available was water troughs set up by ranchers for their cattle grazing in the forest. The wild horses weren't close to most of those tanks so a group of horse lovers were hauling water to tanks they set up for the horses. The owner of our RV park was filling the tank in the top picture which holds 500 gallons and hauling it into the forest to several troughs like the one in the bottom picture almost everyday for several weeks. He was one of many doing this as part of the Equine Well Being Rescue. They pay for the water and drive their own vehicles to get the water into the forest. They don't get any kind of reimbursement.
We rode out there one time just to see how many horses were enjoying the water. There were several big herds not too far from the water. The effort saved them and everyone breathed a sigh of relief when the monsoons started. The rain filled up all the catch basins, creeks and any other low spots that would hold water. Now the forest is green with flowers of every kind blooming.