You are only a couple days away from the vet, so unless something changes drastically I would agree with holding the line and using the same food until then.
There are rescues which are better run than this shelter and you might be able to find one which is supportive and appreciative of all your work and effort for those little guys.
There are rescues which are better run than this shelter and you might be able to find one which is supportive and appreciative of all your work and effort for those little guys.