If anyone else is old school enough to still be using Nalgene bottles (I'm one!) here are some plans to build a water bottle cage to carry the beasts (also works with PowerAId and Gatoraid 32oz bottles).
Here are plans and instructions (
http://home.windstream.net/JHLange/SeatPost_Bike_Cage.pdf) for Gen 1, which is a bracket for standard waterbottles.
Here are templates to make the Nalgene Version: (
http://home.windstream.net/JHLange/JHL_WB_WB_ASY.PDF)
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Why bother? I like using these bottles with my UV water purifier.
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Comparison of monster cage to standard cage:
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