I liked the spray bottle holders scattered here on Printables - tried a couple in resin but found the walls pretty thin for my needs.
Looking for something a little more organic / robust for the barn, I came up with this design.
Horse approved.
Anycubic Basic Gray - .05mm/3sec exposure - (your settings may be different)
2 sizes, try them both.
The author marked this model as their own original creation.