1. There's a company out there that makes two water bottle cages that are "welded" together so they fit on one braze-on. The second cage is "stacked" on top of the other so it's the same width as one cage. Don't remember the company, but I found it once after some Googling last year.

2. Twofish makes a cage that secures anywhere on your frame via a velcro/rubber block system. I used this to put a cage on my downtube when I needed three water bottles.

3. As said elsewhere, put the bottle in your jersey pocket.


The Amazon reviews on that dual chambered bottle were pretty awful.