Don't foget the cat!
If you go to a shppe (pet store for example) they can help you when you tell your situation. Brands do have food for kittens and you should use that, kitten food.
Is there a change that the kitten might come and eat from your hand? That would give you the change to see in what kind of condition it is. I sure hope it isn't hurt.

I hope you could catch this little one and get him safe. I bet he's cold out there