I don't use chick starter since my local pet store only offered medicated which my dad was highly against. So I use oatmeal which I blended in a food processor until it became like sand, mix in with a little bit of gritz, and smashed boiled eggs with the shells. As a treat I sprinkle some toasted peanut skins (not shells).
None of the foods you mentioned are good for your chicks--- they're all considered treats for older chickens, except the eggs. Chicks shouldn't even be given treats until they're about a week old or older. The gritz you mentioned... do you mean ground cornmeal? Have you cooked it, and the oatmeal? If fed anything at all besides chick starter, they MUST have chick-sized grit available. Grit is sharp granite-type rocks that all birds need to ingest in order to be able to process their food and should be offered separately, not mixed with feed so they can regulate how much they actually need. Without grit, they will get impacted crop and could die. The eggs shells do not work like grit, and they contain calcium which can damage a growing chicks internal organs (eggshells are fine for adult birds though). Chick starter is specially formulated to be water soluble and easily digestible without grit!
Regular pet stores won't have chick starter. Chickens are livestock so only a farm or feed store will carry what you need. Feeding non-medicated is fine. The medicated just gives them an immunity boost against coccidiosis as @Wyorp Rock already mentioned. A sign that chicks are infected is bloody poop and lethargy. Coccidiosis is a very common cause of death in chicks, but can be treated with a dose of Corid.
Coccidiosis & How to Treat It
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