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@hippy
500ml-1L per hour depending on heat and how much you sweat. I can get away with a lot less. It depends on what you're used to and how your body deals with heat, etc.
Weigh yourself before you leave on a long ride. Note what you drink. Subtract what you drink from your weight when you get in and then you know how much you sweat out for the duration of the ride. That's your starting point. Adjust up for hotter weather.
I commute and TT with nothing, use plain water for shorter, easier rides and use SIS GO for anything else.