V.W.
This is going to sound weird, but it's very important to do (I've rescued 5 litters of kittens on my farm after dogs killed their moms).
You can get bottles and kitten formula from the vet (Maybe even wal-mart). After he drinks his bottle, you have to use a warm wet wash cloth and rub it on his tummy in a straight downward motion. Mother cats lick their kittens tummies to get the digestion going because otherwise digestion won't start on it's own. So just use the wash cloth as a tongue, Lol.
The first litter of kittens that I rescued ended up dying because I didn't know this. A vet told me about it, and the rest of the litters have lived.