For something like a toilet where water is staying into it, the force of the spray itself is all that really matters. But, for water that is still (pulling the drain on a bathtub), then yes, absolutely this is true. The spin will be the same as a hurricane (depends in hemisphere), and for the same reason.
Technically, no spinning from the Coriolis effect. Realistically, something tiny like you reaching into the water will create enough movement that you’ll get it going one way or another.
For something like a toilet where water is staying into it, the force of the spray itself is all that really matters. But, for water that is still (pulling the drain on a bathtub), then yes, absolutely this is true. The spin will be the same as a hurricane (depends in hemisphere), and for the same reason.
What about a bathtub that sits exactly on the ecuator?
Technically, no spinning from the Coriolis effect. Realistically, something tiny like you reaching into the water will create enough movement that you’ll get it going one way or another.