If the cage you have for the bunny is wire bottomed, make sure to provide a bedded area where the little one can snuggle off of the wire. Very young kits are susceptible to chilling, and will normally huddle together for warmth.
In addition to plain water, I would offer an electrolyte solution to fend off dehydration. Some people use Gatorade or other sports drinks, but it is very simple and inexpensive to make your own electrolytic solution at home.
I especially like the idea of using molasses and pureed banana in the recipe below (you will probably want to cut this recipe in half since you wont need much):
Things You'll Need
1 liter of water
8 level tsp. of sugar (or molasses or raw sugar)
1/2 tsp. of salt
Instructions
1 Mix 8 tsp. of sugar and 1/2 tsp. of salt in 1 liter of water. Store in the refrigerator for 24 hours. Mix fresh after 24 hours. The National Institute of Health recommends adding only a very small amount of orange or apple juice to improve the palatability of a homemade electrolyte solution.
2 Consider using molasses or raw sugar instead of white sugar. Molasses and raw sugar contain more potassium than white sugar, and potassium is an important component of electrolyte solutions. For the added potassium, puree (or mash) a banana and stir in some sugar and very little salt to taste, perhaps 1/4 tsp. Add some water to thin it out if you have to.
3 Make a solution containing starch. Starches are an important component of recovering nutrients lost due to diarrhea. Mix 1/2 to 1 cup of precooked baby rice cereal or 1 1/2 tbsp. of sugar with 2 cups of water and 1/2 tsp. of salt. Mix well.
http://www.ehow.com/how_5875270_make-el ... ution.html
I would also recommend getting a probiotic paste labeled for goats, sheep, horses, etc. and giving a small dab of that per day until the little guy seems stable.
I hope all goes well- please keep us updated. :clover: