but do I need to worry where dirt comes from? The landscape place does not know. And I know they eat the dirt.
Am I worrying too much? Should we just get the dirt? I don't think all that standing water is great either.
what I think you should do is just get the dirt and not worry. With dirt all you can go on is that it is good i feel you are worrying too much. You do have the right idea though to get dirt to help fill the water but be careful it will create mud witch can be bad for the chickens too.