Originally Posted by
cyccommute
The simplest solution is an 18 oz water bottle instead of a 20 oz water bottle.
Something like this (Maybe not
that one exactly but something similar
). It's not as convenient but it fits.
I would also suggest ovalizing the holes on the both cages. You should be able to move the down tube bottle up a little so that you can move the seat tube bottle down a little. Most bottle cages already have some adjustment available but you can take a file to the holes and make the a bit longer.
The down-side of smaller bottles, less water for long rides. The Kona (reference photo in the first post) is Lisa's endurance bike. Machining the bottle racks could help for a small difference. I'm hopeful the the
cage adapter I order will give the flexibility needed for larger bottles. I'm post an update when it gets here from Australia (long distance order
)