I don’t think I would want to know, I pre load the event with high sodium eats the day prior, a couple three IVs throughout the course of the day. And I have never counted how many bottles of water and Gatorade, maybe 8-10? When the heat index is North of 110 you have to stay ahead of the hydration curve. Typically I only pee once during the day and I am pounding fluids. Not a dry spot on ya, but I figure as long as I can still pee I am good to go! The guys that don’t stay ahead just never are able to finish the day, they drop like flys in the early afternoon. Sure makes ya think of…….”On my command, drink” When done, you will hold your canteen directly above your head upside down.