I have a great recipe that I've raised a lot of newborns off of. It was in Cat Fancy mag. years ago. Ingredients are easily obtained from the market. I always add vitamins to each bottle however to provide extra nutrients such as taurine and iron etc. I use half the amount I posted for newborns, and as they get older you can use the full portion.

1-TBS Honey
1_Tbs. Heavy Cream
2-raw egg yolks
2-packages of Knox Unflavored Gelatin (found in baking aisle)
1-12 oz. can of whole evaporated milk (not sweetened)
24-ozs of water.
****Use only half above amounts***
Mix all ingredients EXCEPT for the water & gelatin into a sealable container.
Pour water in a small saucepan, add gelatin package (one envelope) and heat on low stirring just until the crystals dissolve. Too hot and it gelatinizes. Mix into egg yolk/honey/etc. mixture and refrigerate. It will turn into a gelatin mix when cold. I use small plastic margarine containers to scoop a blob out, and then microwave it just until warmed. Test on wrist to be sure it's not too hot. With the kitten nursing bottles I find that cutting an X down from the tip of the nipple, and radiating down the sides works best for milk flow. Not too big an X for tiny ones though. As they get bigger, and suckle better I will loosen the bottle cap to allow air back into the baby bottle. Otherwise they suck so hard they poop out. Also never tip the kitten on its back as milk can aspirate into the lungs. Visualize them nursing off mom, and hold them belly down. I hope you know also that at that age they need to be stimulated to go to the bathroom. Messy, but critical. My dogs usually do that part thankfully. Keep us posted..and be prepared for very little sleep! If they are that weak every hour or two until they get stronger.