The Idiom “go through fire and water” means to experience many difficulties or dangers in order to achieve something.
I love when moments like this get captured on film. I always wonder what became of the people in them.. I bet they wouldn’t have guessed that half a century later people would still be admiring them. And think how important that kiss must have been to the both of them, to go to all the trouble. I hope to be kissed with such fervor someday. And I hope they made it.