I ain't bringin that horse back to the watering hole, much less try and make him drink it. He's been there. Still, he was only on the edge and never drank, only sipped the water. He wasn't thirsty.
He knows where it is and when he gets thirsty he'll want a drink.
Then, he can look for a new hole, an old hole or the watering hole he only sipped at, but is oh so good.