I remember when I and my brothers had a rabbit as a pet when we were younger. We used to have a hutch and we would keep sawdust in the bottom and then we would put hay in as well along with rabbit food and vegetables such as carrots, lettuce, cucumber and such.
We also ensured the rabbit had fresh water daily in a water bottle as well and we would let the rabbit come out of the hutch daily either in the garden in a run or in the house in a run if the weather was bad.