Question: how do you calculate how much water a horse should drink per day?
Answer: The average horse will intake 5 to 10 gallons of fresh water per day. Just like humans, different horses crave or need different water amount intakes. A horse deprived of feed, but supplied drinking water, is capable of surviving 20 to 25 days. A horse deprived of water may only live up to 3 or 6 days.