Here's a few pictures of the water bottle holder I cobbled on my R1100RT. I already had the accessory shelf, so it was just a matter of taking an aluminum water bottle cage from my bicycle, bending it, then mounting with stainless steel hardware.
With the bottle in the carrier, it does block my view of the 'battery idiot light' and my left turn indicator, but the all important 'oil light' is still in full view. Some sacrifices had to be made!
Total cost, (not including the shelf or water bottle); about $12.00.
Not bragging, just sharing some ideas.
drink holder 3.jpg
drink holder 2.jpg