What did you use to mount the water bottle holder? I bought a Looney Bin, which I really like, but I'm not having a lot of luck mounting it to the pole.
I tried this (
https://www.amazon.com/gp/product/B0111FN8WY/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 ) because it seemed like a perfect adjustable clamp/mount for the pole, but it has a design flaw: a very thin/weak spot in the middle of the cheap plastic piece that rotates. Those clamps broke in that thin area - twice.
I am still hoping to find a metal clamp that works in a similar fashion, and am still considering mounting a water bottle cage (or two) directly to the sheet metal of the Delta box (still hoping for details on how people have done this!).