[Paddlewise] Hydration systems

What's the collective wisdom of this fine list with regard to hydration systems --- something beyond the liter of Gatorade under the bungees?  I'm thinking of the Camelbacks, the on-deck bags, the under/through-deck reserves, etc.  With a relatively high center of gravity and a bunch of <20" beam boats, I'm not that excited about adding two liters of solution on my back, but I haven't seen that much that's easy and clean for on- or under-deck installation, and would welcome any and all ideas!  

Thanks.

Jack Martin
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