I do Boxer rescue and 'specialize' in taking care of newborn puppies and kittens for our local shelter.
WalMart does have kitten replacement milk. Ask the pharmacist for a medical syringe without the needle. Use it instead of the dropper. You can give the plunger a little pressure and it makes it easier for the babies to get the milk. They don't have to suck as hard as they have to with a bottle. I have had lots of babies that can latch onto the tip of the syringe and you can actually see the plunger move.
Do not use the milk replacement for puppies - it does not have the fat level that kittens need. Kittens are much more delicate than puppies.
Make sure that you wash their faces after every feeding. Since they came from a coal mine, they are going to be very high risk for eye infections. It is best to wash their faces with saline solution - the same that you use for contct lenses.
If you have any questions, let me know. I have been doing this for 20+ years. It is not unusal for them to settle quickly and usually become extremely loving and outwardly affectionate. Just like most rescues, they seem to know that their lifes have been saved and are saying thank you for the rest of their lifes. The momma cat was feral and has probably been mistreated by people in the past. For the babies - people are just an unknown factor, not something to be afraid of. Love the pictures. Make sure to keep us updated on their progress.
OH - when the vet does open, purchase a tube of NutriCal or the equivelent. This is jelly like stuff that is packed with the vitamins and minerals that they need. I have had sick animals basically live on it for a while. They can get all of the nutrients that they need from the gel. Just squeeze out a pea-sized ball on your finger tip and smear it on the roofs of their mouths. They will react violently the first few times, but get used to it quickly. They do like the taste of it, even though it doesn't look like it. :thumbup: