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