FluidTank NBT

[DirtEngineer]

I'm making a projectile weapon item that fires a fluid.  Currently, I am using a FluidTank to store said fluid in the weapon.
My issue is that I can load a different fluid into the weapon, but that fluid does not persist for the next instance.
I know about NBT data and I know that the bare-bones FluidTank and FluidStack have logic to save the data and load it from a provided tag.  I see where, with a Block Entity, the actual data is made available via a provided tag on the Load() method.
I don't see any such mechanism for the FluidTank.
Am I just looking at this completely incorrectly?

[poopoodice]

There is writeToNBT and readFromNBT?

[DirtEngineer]

On 10/12/2022 at 12:49 AM, poopoodice said:

There is writeToNBT and readFromNBT?

Yes, those exist, but readFromNBT takes a CompoundTag as an argument.