[1.15.2] Custom item's variable is shared throughout all instances of the item

[FossilFind]

I have a canister item that holds 20 buckets of a fluid. It uses FluidStack to hold fluid and amount but when i change the amount on one item all of the instances of the item also change.

 

Item class:

public class CanisterItem extends Item
{
	private Supplier<? extends Fluid> supplier;
	private FluidStack fluid;
	
	public CanisterItem(Supplier<? extends Fluid> supplier, Properties builder)
	{
		super(builder);
		
		this.supplier = supplier;
	}
	
	@Override
	public void addInformation(ItemStack stack, World worldIn, List<ITextComponent> tooltip, ITooltipFlag flagIn)
	{
		if(fluid == null)
			fluid = new FluidStack(supplier.get(), 20000);
		
		if(KeyboardHelper.isHoldingShift())
		{
			tooltip.add(new StringTextComponent(fluid.getAmount() + "mB / 20000mB"));
		}
		else
		{
			tooltip.add(new StringTextComponent(fluid.getAmount() / 1000 + "B / 20B"));
		}
		
		super.addInformation(stack, worldIn, tooltip, flagIn);
	}
	
	@Override
	public ICapabilityProvider initCapabilities(ItemStack stack, @Nullable CompoundNBT nbt) {
		if(this.getClass() == CanisterItem.class)
			return new FluidBucketWrapper(stack);
		else
			return super.initCapabilities(stack, nbt);
	}
	
	public Supplier<? extends Fluid> getFluid()
	{
		return supplier;
	}
	
	public FluidStack getContents()
	{
		if(fluid == null)
			fluid = new FluidStack(supplier.get(), 20000);
		
		return fluid;
	}
}

 

[poopoodice]

There's only one instance per Item. To store informations on ItemStacks you can use either Nbt tags or Capabilities.

[Draco18s]

16 minutes ago, poopoodice said:

you can use either Nbt tags or Capabilities.

No, Capabilities only. NBT is meant for serialization only.

[FossilFind]

Could you refer me to a good capabilities tutorial then as I am not familiar with them.