Custom Items for Survival?

Hey everyone! I'm looking to set up a crate for my survival server that gives out quality of life items—stuff that’s fun and useful but not game-breaking. Some ideas I’ve had so far:

Infinite Milk Bucket (great for clearing effects)

Bottomless Potion (like endless fire resistance or water breathing)

I’d like to expand on this list, but before I get too deep, I’m wondering:

Is there a plugin or API that makes it easy to create custom items with unique behavior like this?
Ideally, I’d want players to use these items like normal ones, but with special functionality behind the scenes.

Any suggestions or examples would be awesome! Thanks!
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