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 at the very top of the file.

ZenScript
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import crafttweaker.api.fluid.MCFluid;

Creates a new IFluidStack with the given amount of fluid.

Return Type: IFluidStack

ZenScript
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MCFluid.makeStack(amount as int) as IFluidStack
myMCFluid.makeStack(1000);