As with all animals, a well-balanced diet is very important. Your horse needs the right quantity and quality of food. Be careful not to overfeed - a horse doesn't stop eating when it is full.
You should feed your horse a minimum of twice a day. Get veterinarian advice on the most suited feeding program for your horse.
Ensure that a fresh water supply is available to your horse at all times. A healthy horse can drink up to 12 gallons of water per day.