Kim
That’s such a tough question and I don’t think you should be beating yourself up over the losses. I know this is devastating, but you were trying to do the right thing. Even so, I have to go with “if you don’t have the funds to provide proper vet care than maybe the kitten/cat needs to be where it can be provided when needed”. Especially when you first bring in a new kitten/cat, they should be examined by a vet to ensure there is nothing wrong. Kittens coming into your home may have gone through some difficult situations that may have weakened their immune system making them susceptible to illness. They may also have been exposed to illness prior to coming. You’ve done a wonderful thing saving and helping these babies, but if it is becoming overwhelming financially I feel you need to limit your intake to what you can afford. Best of luck to your rescue efforts!