I just take a little hay from my two ewelings' hayrack and plunk it on top of the rabbit cages. They eat it from below. Whatever hits the ground ends up as bedding for the sheep girls. The chickens (who also live in the barn and can pass through the wire to the sheep) scratch around and eat (yes, they do
) the rabbit and sheep droppings.
The bedding eventually makes its way to the garden. I pick extra cabbage leaves, flowers, bolted lettuce etc. and weeds from the garden. That's mostly what the rabbits eat, at least in summer. I also cut grass for them with my pocket knife while I'm sitting out with the sheep. It goes on top of their cages too, and if there's too much for them to eat right away, it dries there and turns into hay.