Contact McMurray Hatchery BY PHONE immediately and cancel the cocci vaccination if you can't get non-medicated feed locally. 1-800-456-3280
We did a brooder kiddie pool too. You might want to think about surrounding it with 4' high chicken wire fence, or those chicks of yours will be flying out by the time they are a few weeks old. We found none of ours got over the 4' high fence, although our White Faced Black Spanish did make the attempt. I talked about and posted pics our brooder set up in this post...
https://www.backyardchickens.com/forum/viewtopic.php?id=630
We did a brooder kiddie pool too. You might want to think about surrounding it with 4' high chicken wire fence, or those chicks of yours will be flying out by the time they are a few weeks old. We found none of ours got over the 4' high fence, although our White Faced Black Spanish did make the attempt. I talked about and posted pics our brooder set up in this post...
https://www.backyardchickens.com/forum/viewtopic.php?id=630