I feed my rabbits Swanson's Rabbit Feed which I get from my local farm supply store. I also feed them Orchard Grass Hay instead of timothy because I can buy it in a bale and they seem to enjoy it more. They eat pellets in the morning and at night I give them lettuce, cumbers, and carrots and every once in a while I will give them Cilantro, Mint, or Basil. Here is a list of all of the other acceptable vegetables, herbs, and fruits you can feed them.
Veggies and Herbs
(These need to be rotated due to oxalic acid content)