When it gets really hot, my least favorite thing is climbing on relatively fresh asphalt where I leave a groove behind me and the bubbles pop as I ride along.
On hot rides, I pretty much always use a 70 oz. light Camelbak. Bottles just don't hold enough and they get hot. I fill it most of the way up with ice before I start and hope to replace ice along the way. Sometimes. Besides the cool and the quantity, you'll just drink from a Camelbak more frequently than you'll reach for a bottle. Not, it's not roadie. I've gone through the whole thing in 25 miles of climbing and didn't have to pee. The bad thing about insulated bottles is they don't hold as much. I've tried two 1-liter bottles, but the hot water is nasty and one is not as likely to drink it.
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