I have a wooden box about 10 inches long by 6 in wide and an in tall and I fill that up to the top, and another cardboard feeder just a little bigger, I've given up on store bought feeders. They'll scratch in these boxes still getting food everywhere, but I won't refill them until they eat what they've thrown everywhere. There is a lot less wasted because of poo and they still get to scratch around in the shavings afterwards. It was hard keeping those dishes near my water though, I've set everything up to where my water is in a section with no bedding it makes a HUGE difference.