I never cache water, because something could happen to it... like someone taking it. I don't want my life to depend of something that could be removed.
I hike mostly in deserts. I live in the Lower Colorado Desert, where some years we go zero inches of percipitation. Average is around 5 inches. Water here is the difficult to find. In the Mojave Desert (high desert), water is usually easier to find.
First know your water needs. Everyone's body is different.
Desert water sources are not usually 100% accurate. Verify before leaving on your trip.
In really hot weather, rest during the heat of the day (noon- 3 PM). A tarp helps, because trees may not be available.
Limit cooking with water. However, cookless meals may weigh more than the water needed to cook something. So plan accordingly.
In hot weather, you are going to sweat away salt and minerals, replace them. Salty food is good, but you will drink more water.
Drink frequently, do not wait until you are really thirsty.
In warm/hot weather, you need little gear. Sub 3 lbs or even 2 lbs is possible. But you will carry lots of water to make up for the light base weight.
Water weighs ~ 8.3 lbs. I have carried up to 3 gallons on desert trips.
Wear a wide brimmed hat.
Wear light colored clothes. Long sleve shirts and pants, not shorts. It will help reduce evaporation and protect your skin from the sun. Critical if you have a long hike between water sources. For short hikes between all my water sources, I wear a T shirt and shorts.
I have been hiking in my desert for over 30 years, without getting into a critical situation. But almost every year someone dies from heat exhaustion when hiking in the area. Plan, plan, plan.
On most of my desert trips, I will not see anyone else. That is what I like best about the desert.