BTW, here's the desert waterbag you asked for. Unfortunately no stopper is visible. We're not sure where or when this photo was taken. The mechanic's coveralls seem to say (something) Canyon Airlines. This could be the stop in Tucson on the way to Miami for the second attempt.
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Of interest is mention of Scenic Airways painted on the front of a hangar. Scenic Airways was an air tour company based out of Phoenix, AZ. It was founded by Register pilot J. Parker Van Zandt, and it is still in business to this day.
The first commercial air tour of Grand Canyon was on October 3, 1927, predating this reference by four years. Shortly, the Great Depression took its toll on the Scenic Airways operation. Van Zandt sold the company and assets to some local Arizona pilots ("Air Investor's" mentioned in the description?).
The company was changed to Grand Canyon Air Lines (note, two words). A short while later the name was simplified and changed to Grand Canyon Airlines.
Dan