A LiquidStack consists of a Liquid Definition as well as an optional tag and an optional amount value.

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.liquid.ILiquidStack;

An ILiquidStack can be created by using the Liquid Bracket Handler

ZenScript
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//see The liquid bracket Handler for further information
val lava = <liquid:lava>;

//liquid.withTag(Tag as IData)
val lavaWithTag = <liquid:lava>.withTag(DATA);

//liquid * amount in millibuckets (-> 1000 = 1 Bucket)
val lavaWithAmount = <liquid:lava> * 1000;

As an ILiquidStack represents a liquid, there surely must also be a way of retrieving the fluid's properties.
Check the table to see what you can retrieve from the ILiquidStack Object using ZenGetters.

Zengetter	What is this?	戻り値	例
Zengetter name	What is this? This returns the unlocalized liquid name	戻り値 string	例 test = <liquid:lava>.name;
Zengetter displayName	What is this? This returns the localized liquid name	戻り値 string	例 test = <liquid:lava>.displayName;
Zengetter amount	What is this? This returns the amount of the ILiquidObject	戻り値 int	例 test = <liquid:lava>.amount;
Zengetter luminosity	What is this? This returns the luminosity of the referred liquid	戻り値 int	例 test = <liquid:lava>.luminosity;
Zengetter density	What is this? This returns the density of the referred liquid	戻り値 int	例 test = <liquid:lava>.density;
Zengetter temperature	What is this? This returns the temperature of the referred liquid	戻り値 int	例 test = <liquid:lava>.temperature;
Zengetter viscosity	What is this? This returns the viscosity of the referred liquid	戻り値 int	例 test = <liquid:lava>.viscosity;
Zengetter gaseous	What is this? This returns whether the referred liquid is gaseous	戻り値 boolean型	例 test = <liquid:lava>.gaseous;
Zengetter tag	What is this? This returns the ILiquidObject's tag	戻り値 IData	例 test = <liquid:lava>.tag;
Zengetter definition	What is this? This returns the referred liquid's definition (see below)	戻り値 ILiquid Definition	例 test = <liquid:lava>.definition;

Java Jargon: ILiquidStack implements IIngredient. In other words, all methods that can be used in IIngredients can also be used for ILiquidStacks Refer to the IIngredient entry for further information on this. Here are some special cases, as liquids just aren't items

• You can't mark ILiquidStacks, and you get null of you try to retrieve an ILiquidStack's mark
• .items returns an empty List
• .itemArray returns an empty Array
• .liquids returns this liquid as ILiquidStack (so, exactly this object)
• LiquidStacks can't have Transformers and asking for transformers always returns false
• LiquidStacks can't have Conditions (.only doesn't work)
• Matching with items always returns false