Slipped and fell in supermarket

Generally speaking, if you bring an action for personal injury you will need to prove damages. Here it appears there are none. Frankly, that's a really great outcome for you and you should be delighted you weren't hurt! Here, I think it's best not to think about a lawsuit in this case, but it never hurts to consult local counsel to determine the merits of the situation in more detail, however...

...you can always file reports with governmental agencies about the nature of the store's environment. Call you local county operator and ask for the departments or agencies, both state and local, that you can best make a complaint to about the store. And if someone does get hurt in the future and your letters are available, this will help them make a better case against this supermarket!