Most "wild" mammals are entirely satisfied drinking water once a day.
I wonder how that plays out with the human animal.
Have you ever had the opportunity to observe a horse drink water? Takes a while.
An aside,.... animals that LICK water, eat meat. Animals that DRINK water eat plants ....
I'm sure there are exceptions... like fish, they have a hard time drinking ... ;-)
Actually, I've found that our crew only really do those long drinks if they're bordering on dehydration - usually they'll chug once right after work, which I think is what most people see?
Even on long conditioning rides, if they're not overheating they really seem to prefer to get a few liters and move on, water scarcity be damned. Some of our older distance horses have sort of learned to get it when they can, but I took the baby out on on his first long run the other day and had to spend forever trying to scam him into drinking an extra liter at every creek.
On spring/summer pasture it sometimes looks like one drink a day because they're taking in most of their water in grass, but then the actual intake is basically equivalent to a bunch of little drinks all day, I imagine. In winter stalls a lot of them will soak their dry hay in their water bucket & snack on green slime all day, which I guess they think is the winter version.
I don't know as much about other large mammals, but my impression from horses is definitely that they'd rather sip all day if it's an option.