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Rule of thumb for me is 1 bottle per hour minimum. My commute is 1:15, and I aways start with 2 full bottles. On long supported rides 2 bottles is more than adequate, as there are usually waterstops on the route. If I go out for a long training ride, and it is really hot, I'll put a 3rd bottle in my jersey pocket, unless I know there is a place to stop and refill. I had a kidneystone issue last April, and dehydration can be a factor, so I really watch my intake carefully.

DEMON