I bottle fed a whole litter of abandoned kittens last fall... I hated the bottles you can buy... it was so hard and they didnt work as well as they should... I got a syringe from the vet but any medicine syringe works well. also please remember not to hold him on his back when your feeding him that is very dangerous. The vet told me about 1cc about four times a day or feed him til they quit eating. Get a warm wash cloth and wipe him down after every feeding.... sometimes they end up getting runny stools with a change in milk so make sure you wash his bottom with baby shampoo (then blowdry on low) keeps them from being cold. I also prepared them a box with a nice fleecey blanket. After you put it to sleep it helps to cover the box alil with a towel so it cannot see you walk by... otherwise your gonna hear meow meoww meow a lot lol because you become momma! its very cute though
Also I wouldn't use this all the time but incase you run out of milk and cannot get to the store this is an emergency formula i used... but it would be best to give him the pet store kind. This is just for emergencies. I hope this helps I know its scary when their life depends on you... good luck and if you have any questions feel free to message me. I am not a pro at this but this is what i did. again goodluck!
1/2 cup water
1/2 cup evaporated milk
2 Tablespoons Karo white syrup
1 beaten egg yolk
2 Tablespoons cod liver oil, baby vitamins, or kitten vitamins.