I received a hydration system today for my 2015 R1200GS.
It was fabricated by:
Garauld Techworks LLC
61 John Smith Road
Binghamton, NY 13901
Photo's courtesy of Gary Crowley, Proprietor:
This shows the system in place.
The OEM footpeg is easily removed by pulling out a circlip at the bottom of the pin that the footpeg rotates on, then replacing it with the nicely machined part provided. The actual mount bolts to that part, and includes a clamp to hold the Coleman half gallon cooler, also provided.
The system comes with these supplied parts.
I ordered mine in flat black, to match the blacked out parts of my R1200GS, which matches the photographs.
I learned about these hydration systems by following the reporting of the last Iron Butt Rally, which showed many riders with some kind of hydration system.