Originally Posted by
waynesworld
I would start with a 24 ounce insulated Polar bottle. I like mine a lot. Are there no braze ons for another cage on the seat tube? Aside from that, you could strap a bottle or two to your rack, then stop and swap them out when necessary. You could to the same with the cages you have, just switch the full one to the cage that you can reach.
+1 on the Polar bottles. I carry 4 of them, 2 in cages and 2 more in panniers w/ damp towels around them. 3 hours later and I still have bits of ice in 'em.
Hard to believe the OP's seat tube doesn't have bosses on it! That sucks. The bottle on your bike doesn't look much smaller than a Polar bottle, you may be able to fit one in there. I ground the side & top lid on one of mine putting it in the low cage like yours. I didn't have fenders on a suspension fork bike, hit the front brakes and drove the bottle into the wheel. Watch out for that! You have fenders so you ought to be safe.
Before I bought my new bike & panniers I had a Topeak Explorer rack with the big MTX trunk bag. That thing was great for carrying water, like 5 or 6 bottles! Get that many in there and it was a bit top heavy, but it got the job done. It was insulated, too. Wrap a few of those soft ice packs around the bottles and you're set.
http://www.amazon.com/Topeak-MTX-Tru.../dp/B000FICAQ4