My girls have been here since Wednesday and so far I haven't given them any grit or oyster shell. I was just going to sprinkle it in their feed but then I read not to. Today I got a soft shelled egg so I want to start today. What should I use as a feeder? Would a plastic bowl do? Can I put the grit and shell together (side by side or mixed?)? The coop is starting to seem crowded with feed and water and needing to add additional feeders!