Hi Ang --
Just read this... Last year I rescued 5 wee ones (from 2 weeks until they were about 5 weeks old) and we used the milk replacement -- KMR I think.
We relied pretty heavily on this site:
Hand Raising & Bottle Feeding Orphaned Kittens
Hang in there, and in addition to prayers your way -- keeping fingers and toes crossed you end up less stressed. You can only do your best, Angie. Don't be too hard on yourself.
Hope this helps!