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>;

Zengetter	역할	반환 타입
Zengetter name	역할 Returns the potion's internal name	반환 타입 string
Zengetter badEffect	역할 Returns if the potion effect is bad	반환 타입 bool
Zengetter liquidColor	역할 Returns the potion's color	반환 타입 int
Zengetter liquidColour	역할 Returns the potion's colour	반환 타입 int
Zengetter curativeItems	역할 Returns a list of all curative Items for the potion	반환 타입 List<IItemStack>
Zengetter hasStatusIcon	역할 Returns whether the potion has a status icon	반환 타입 bool
Zengetter isBeneficial	역할 Returns whether the potion is beneficial	반환 타입 bool
Zengetter isInstant	역할 Returns whether the potion is instant	반환 타입 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);