How often do chickens need to eat grit? Originally food & water was offered only underneath the raised coop in the ladies run (they have 24/7 access to their run), but with the cold weather, we realized there would be days when the girls wouldn't leave the coop & needed food/water inside. Sized originally for roosting/nesting only, I've managed to squeeze in small feeders of water & food (already making plans to rebuild a BIGGER coop next spring). Our weather has been all over the place, so we haven't been able to get a feel for when the ladies will step outside; as of now, it's not often. Apparently we took home the biggest cold weather wimps the store had for sale - these girls do NOT like winter! (Not to worry, we made sure to buy winter-hardy chicken breeds) Can I mix a small amount of grit with their coop food to keep it to one container? Thanks for any advice! Ugh, just when I think I'm feeling less nervous about our hens & winter, something else crops up.