If Batman needed to, could he defeat and kill and angry Superman without green Kryptonite or any of its isotopes?
I've seen Batman dish out some brutality on Superman, but in most cases, as evil Supergirl comments, it's 'tricks' at best. Or, Batman dishes out the pain while using green K to otherwise weaken Superman. He's used sonics, electricity, etc, and while harming him, I'm not sure I've seen any alternate tricks actually down Superman to the point where Batman could kill him.
So if Batman didn't have Kryptonite (perhaps it never made it to earth), has he ever demonstrated an ability to still be able to kill Superman if the need arose?
Batman for all his skill and intelligence is still a normal human. The only way he could ever beat someone with super powers is by exploiting a weakness. He's never going to outpower anyone with super strength, only outhink them. So with no Kryptonite Bruce has almost zero chance against a Supes who WANTS to beat Bruce.
The only possible way he could do it is through magic and I'm sure if it came down to it DC would write Batman as having some kind of magical backup (ala Zatana or Fate) or even have Bruce become "Batman, DC's Sorcerer Supreme"