You probably want supports under the base and to support the top of the handle. No supports inside! Photos show Prusament PETG Ultramarine Blue. There are baffles to reduce spillage. One fill is usually enough for my Bonsai.
It takes more time, but it is recommended to use 6 perimeters and 0.15mm layers.
Check out this blog post for more information on making your tub toys water tight.
https://blog.prusa3d.com/watertight-3d-printing-pt1-vases-cups-and-other-open-models_48949/
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The author marked this model as their own original creation.