I leave about two cups of dry food out every morning for the six of them to munch on.
That's about what I put out in the morning. About 2 cups...but I have 3 kittens as opposed to 6. Now I know kittens eat more...but jeez, to find the bowl almost empty when I got home when I thought I was putting out more than enough food for the day was a bit disconcerting. I'm going to ask my vet and see what she says. But until I get there, I'm going in 2 weeks. I'll make sure the bowl is always food. Piggies!!