Just a quick update that I still have one barrel that is half full as we enter July. I have used it for the new trees, shrubs and most of the veggies. This reduces the amount of water used from the hose and sprinklers, which saves water.
Using a few containers of rain water is a great way to water veggies, shrubs and flowers, and this manner of water conservation (and many others) just makes sense in a desert.
Have fun, stay hydrated, cool and enjoy the summer!