The standard rule if you are doing any measure of physical work is 1 oz of water for every 2 lb of body weight. This was a wildland firefighter standard back in the day. If you were actively fighting fire or in extremely hot conditions you should expect a double that number.
I weighed 240 lb at the time so 120 oz of water. I rounded it up to a gallon. And double that when the work got brutal.
On a warm day on the farm doing physical work, 3 or more gallons is not unusual. It really depends on what is going on, temperatures, physical activity. On warm hunting days, I have to plan around water sources, or it would be a short hunt.
Winter time, just piddling around, probably half gallon a day, mostly in herbal tea type of drinks, as the farm well water is undrinkable. The redhead adds ginger / cucumber to her drinking water to increase palatability. Seems like a better choice than a bunch of chemicals from a packet?
