[header] How to feed a horse [title] Provide your horse with plenty of fresh, clean water. [step] Horses require between 5-15 gallons of water per day. If possible, make sure that your horse has access to water at all times. 
Otherwise, make sure that you water your horse at least twice per day and allow several minutes for your horse to drink. [substeps] Make sure that the water in your horse's trough is clean and not frozen.