3D PRINT SETTINGS
For a watertight result, make sure your printer is well calibrated and lubricated.

Set the resolution (layer height) to 0.2mm / layer
(or more. Watering cans on pictures were printed with 0.3mm / layer)

Then, increase the wall line count to at least 4.

The model is "full" so you need to cancel the infill and top layers.
So set the infill to 0%.
And set the top layers to 0 to cancel the top faces.

And to make the bottom watertight, the bottom thickness needs to be at least 2 to 2.4mm.
So set enough layers to reach that thickness (in Cura), or set the bottom thickness to 2.4mm (in Bambu Studio).

In Bambu Studio, you also need to **uncheck "Ensure vertical shell thickness", otherwise you'll end up with patches of extra thickness here and there inside the can.

And no need for supports or brim, so:
Build adhesion type: None
Supports: None