How can I have separate floats for each gameobject?

So, I am a newcomer unity Developer and I am facing a problem where I just learned ray casting, and I'm playing around with it. now that doesn't matter; I wanted to know how to have separate floats for each of the game objects which are my enemies. like, for example, I had two Enemies on one scene and I had a Health float one them and whenever I shoot them The health drops and they will be destroyed. but the problem is when one of them get destroyed the others die too. cause they have the same script on them and the same health float. how can I do something for this? I don't want to have one script for each and every one of my enemies. I want each of then to have Separate Health floats with one script. also my game is 3d haha. Thanks -a "newcomer who is not the best at English"