The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.forge.api.event.entity.player.FillBucketEvent;

FillBucketEvent extends PlayerEvent. That means all methods available in PlayerEvent are also available in FillBucketEvent

Name	Type	Has Getter	Has Setter
Name emptyBucket	Type IItemStack	Has Getter true	Has Setter false
Name filledBucket	Type IItemStack	Has Getter true	Has Setter true
Name level	Type Level	Has Getter true	Has Setter false
Name target	Type HitResult?	Has Getter true	Has Setter false