My chickens enjoy their winter morning mix of: chick scratch or cracked corn (keeps them warmer, use whole oatmeal in summer), ground blk sunflower, ground or chopped veggies, organic feed crumbles, ground alfalfa, ground/dried red peppers (worming), Tblsp of poultry supplement, & enough kefir to slightly moisten. The kefir has milk fat & moistens the mix but does not make it freeze in winter, it's like yogurt but drinkable, make it yourself without heating, make the next batch using some of it as a starter & drink some for your health, you can buy dry refrigerated starter at health food stores or even better buy online kefir grains for starter. The kefir only takes 12-24 hrs to make by setting on the kitchen counter in glass quart jars with starter in. I only give a small bowl of the morning mix, as it should not be their main feed. It's easy; I keep the dry ingredients premixed & just add some kefir, the poultry vitamin/minerals & any veggies just before feeding. You can also feed sprouted wheat.
In the summer, this morning mix can be alternated with water to moisten instead. They also get wedges of watermellon on hot days especially to keep hydrated, along with all of the other garden scraps. My bantam flock is small at about a dozen or so, easy to spoil them with treats.
Oyster shell (have a hen or 2 that go to that first thing in the morning), grit (in case they need it), cracked corn (in the winter) & what ever else you'd like to keep out all of the time; they just take what they need.
Edited to add more info