Help wild Baby Rabbit !!! need help?

My cat brought me a wild baby bunny tonight, its about 5 inchs in lenght and the eyes are open we got lucky and she was carring it like a kitten so I put it in a cat carrier and gave it my flees pj top and a dish of water, It went right into the sleve. Is there any thing I should feed it and what, The Human socity will be out tommoro to pick the baby up. I would just hate for it to die overnight.