An IPotion object refers a potion in the game.

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.
import crafttweaker.potions.IPotion;

You can get such an object through the use of the Potion Bracket handler

ZenScript
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<potion:minecraft:strength>;

Геттер	What does it do	Возвращаемый тип
Геттер name	What does it do Returns the potion's internal name	Возвращаемый тип string
Геттер badEffect	What does it do Returns if the potion effect is bad	Возвращаемый тип bool
Геттер liquidColor	What does it do Returns the potion's color	Возвращаемый тип int
Геттер liquidColour	What does it do Returns the potion's colour	Возвращаемый тип int
Геттер curativeItems	What does it do Returns a list of all curative Items for the potion	Возвращаемый тип List<IItemStack>
Геттер hasStatusIcon	What does it do Returns whether the potion has a status icon	Возвращаемый тип bool
Геттер isBeneficial	What does it do Returns whether the potion is beneficial	Возвращаемый тип bool
Геттер isInstant	What does it do Returns whether the potion is instant	Возвращаемый тип bool

An IPotionEffect is a Potion that has a duration and amplifier. You can use these two methods to get one from an IPotion:
As one might guess, both return an IPotionEffect object.

ZenScript
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pot.makePotionEffect(int duration, int amplifier);
pot.makePotionEffect(int duration, int amplifier, boolean ambientEffect, boolean particlesShown);