My feral cat

We have a feral cat who makes daily visits.  Cannot get anywhere near it, but it does come and eat the food I put out for it.  I do have water in the laundry room that it can access through the doggy door. Pretty big cat with long hair, mostly black with some tortie patches. I don't know whether I'll ever get to get a pic or not as it runs as soon as you open the back door.