Importing the package

Link to importing-the-package

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.IPotionType;

Getting an IPotionType object

Link to getting-an-ipotiontype-object

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

ZenScript
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<potiontype:minecraft:long_strength>;
ZenGetterType
ZenGetter
Type
ZenGetter
effects
Type
List<IPotionEffect>

Imitate the PotionType Bracket Handler

Link to imitate-the-potiontype-bracket-handler

This method does the same as the PotionType Bracket Handler.

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//fromString(String potiontype);
IPotionType.fromString("minecraft:mundane");