Hello. So I have exactly 3 week old Pharaoh Coturnix quails outside, and I'm new at this. I've been reading that if you want to feed fruit or something you have to give them grit? Or if they have runny poop? I hear oyster shells but I'm too lazy to order them, so what exactly is grit? And would it work in place of oyster shells? Or I also hear crushed and baked eggshells? Hmm, what would work? Also, I hear to let them dust bathe in sand? Which I do have, so should I give them some sand too? Thanks.