I hate carrying water too. I've tried all the alterternatives - belt, camelbak, handheld, disposable bottle. All of them annoy me. But for anything over 10 miles or when it's really hot outside, I force myself to wear my belt and drink my hydration mix of water, sea salt, mineral salt, and lemon juice. If not, I get really bad dehydration headaches.
That said, if you are hydrating properly before and afterwards, and have no issues, then cool. Your body can certainly be fine for 2+ hours with no additional water.
I came to Primal/Paleo first to lose weight, but kept up because of the way I feel - amazing.
Starting: 249#, 44" waist
Current: 168#, 30" waist
Goal: 140ish# or 28ish" waist