Anyone who has studied American Folk / Outsider art environments is familiar with Steven Dinsmoor and his Garden of Eden. This appears to be a less common period image. Apparently, Dinsmoor kept this handmade object at the foot of the concrete coffin he made...in case he had to grab some water. That is if he was going down instead of up. It's hot down there. See HERE and elsewhere for more pictures. Let me know if you find a picture of the jug in place? You might also enjoy the book / ebook In Situ: American Folk Art in Place by Jim Lindeman. Available for purchase HERE on Blurb.
Real Photo Postcard c. 1920 Collection Jim Linderman
