Maybe try dry chicken crumbles or pellets. I know many here feed fermented feed, and other formulas. I just try to keep it simple. I use Alflock pellets. Less waste and ideal for ALL my chickens. (layers and non layers) I also provide cracked oyster shells free-choice. Alflock is about 2% calcium. Ideal for all non layers as well as juveniles and roosters. Laying chickens need about 4% calcium. Mine get the extra by wolfing down the oyster shells. Chickens just seem to know what they need naturally. During their free range scratching around , they pick what they need. (I know sometimes there are inconsistencies)
BTW. All my chickens live loooooong lives. Unless shortened by predator.