So, you just have one kitten now maybe things will get a little easier to handle. It sounds like he has adjusted to being with you and bonded with you.
I'm not sure if I can help you with the food at one month old since I got my cat at 2 months and she was already on kitten food then. Is your vet any help, if he is caring for the other two kittens now maybe he has advice. We did give my kitten a flea bath at 2 months which she really didn't like but she did need it! I'm sure someone else here will be able to help you, there are some people here who work with young rescued kittens. Good luck with little Catsinova! I would love to see another photo.