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You should already have a circuit breaker at the panel.

A GFCI outlet is needed if your breaker is not GFCI already, but this receptacle is something that isn't terribly expensive.

Yes, that’s what I’m talking about. These are common near a sink but approximately never behind the toilet in home in the US.

Many bathrooms have a light switch close to the toilet. Hopefully it's 3 wire so it's easy to install an outlet a couple feet below the switch.

Aren't light switches and outlets supposed to be on different circuits by code?

No, not in North America.

It's typical nowadays for the whole bathroom to be on a breaker-level GFCI.