where I live, near Ecuator. .. temp goes from 96 up to109 (43C) easy. Thats on my bike moving with wind. so the real temp. is higher. I can drink Up to 5 . 500 ml bottles in 3 hours ez. I drink before I ride too. when we train for races, my urine some times will come out brownish no matter what Ï do, i know this is not good, in races it gets worse, because some times is hard to get bottles from the water guy. I just carry a one liter bottle in my car and when I work, to measure the ammount of water Im drinking, I try to drink more than 3 lts daily . hydration starts before riding and never ends.
on those strange stormy cool days. I feel Im flying. temp limits so much your power