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I bring water for anything over an hour - I live in a desert and my mouth gets really dry. I like the Amphipod handheld 12 oz. For me, a bigger bottle feels too cumbersome and for most runs 12 oz is enough. If I'm on a 2 hour+ run, I'll plan a refill stop.
I would like to get a hydration pack for longer trail runs but haven't figured out what would work best for my small short torso. The Camelbak I have for mountain biking holds 100 ounces and is not comfortable to run in, but I haven't tried anything else yet.