Bands of wild horses head toward water only after the alpha mare decides to drink. Dominant bands get first dibs at the watering hole while others wait their turn. In the wild a horse can survive by filling up with water once every other day. A 1000lb horse consumes approximately 10 gallons a day.
Horses love water and find it a great source of amusement. They are natural swimmers and will dog paddle with their noses held high. They like to paw, roll and wallow in shallow areas enjoying the cool water and a respite from insects. at Arizona