How do you feed a horse daily?

You should feed your horses at the same time everyday, generally 2 times a day, but the more frequesnt and smaller the meals the better. It's best that they always have hay or grass to munch on- you may have to find hay with less nutrient value so they don't get fat though.
Depending on the weight, age, male, female, pregnant, excercise, etc also can depend on the amount as well as winter or summer. In the winter it is recommended that some sweet feed be added for extra energy and free-choice grass hay to help keep them warm. Their diet should be a mixture of feed, grazing and hay.
As a general rule, very few horses actually need grain or any other feed. Grass hay and grass is often sufficient and best for most horses' health.