I used to do wildlife rehab in Corvallis, and baby rabbits are extremely difficult to keep alive. Feed it Kitten Milk Replacer or even goat milk replacer (they come in huge bags at the feed store though), feed it clover, and you can try water, but it's probably not ready for it yet. Continue with KMR in a dropper or kitten bottle, and you MUST stimulate it's bowels, like a mother licks its baby, you take a cotton swab and stroke its belly from top to bottom. The trick is to try and not handle it very much though, it can die from stress.
It you need help, I can probably try, or I would take it to a vet clinic and ask what you or they can do. Hope this helps!