These kits need a vet asap. It sounds to me like it could be a very bad URI.
Here is a link about FeLv...Feline Leukemia

My Vixen is FeLv+ and we were told it can be passed out through sharing of food and water dishes, inter-grooming, intimate contact, open wounds(scratches and bites) etc. It is not airborn.

Milk is bad for the cats. 90% of cats are lactose intolerate so cows milk is not a good idea.

These kittens most definately need a vet to get checked out and treated. They will most likely need to be treated for worms. And probably fleas and maybe even ticks. They definately need a full examination and treatment.

Let us know how they make out.