MCPlayerBrewedPotionEvent

This event is called when a player picks up a potion from a brewing stand. Since it is a MCPlayerEvent, you can already access the getter

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.api.event.entity.player.MCPlayerBrewedPotionEvent;

MCPlayerBrewedPotionEvent extends MCPlayerEvent. That means all methods available in MCPlayerEvent are also available in MCPlayerBrewedPotionEvent

ZenScript
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// MCPlayerBrewedPotionEvent.getStack() as ItemStack

myMCPlayerBrewedPotionEvent.getStack();