I am a bit confused about feed. I bought what I was told to get a crumble laying feed. I chose Nutrena Nature Wise Layer Feed 16% crumble. My hens also have green ground for the moment (Michigan winter coming on) and will be getting black oiled sunflower seeds over the winter. I am reading about corn, grit and oyster shell in a lot of posts. I want my hens to have all they need nutritionally to be good layers. Can someone tell me what if anything else I need to feed them. They have already experienced meal worms and good old fashioned earth worms. I am considering some type of green over the winter in a pecking box. Not sure how that will work out yet though. I need to cover basic nutrition first. I also read something about apple cider vinigar in the water. what is the ratio per gallon? Thank You for any help here.