I agree!!!
I didn't know you were also going to offer the suggestion of egg shells.
That's what we do at our house. Maybe this person in Florida has unlimited free oyster shells (I'm jealous) that he/she could grind up and use. If not I just take a small tupperware type container and a fork and smash, smash,smash the egg shells till they are very tiny pieces! I don't wash or dry them either. My chickens go crazy for them! Not sure if they like the shells or the whites that might be left inside. I feed them in a small dog dish that they can't tip over.
To OP - Welcome to BYC and raising chickens!!!! I have been raising mine since March. I have a few links under my signature line that might help you - How to build an automatic waterer (that stays clean and you dont' have to fill all the time), How to build a 5 gallon bucket feeder (that also is clean and lasts a long time) and how to make an automatic coop door! I swear by these 3 things as I spent hours and hours on this website and Google looking for the best of each......... Check out my links below.