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Deoends on code you are governed by. In USA, a GFCI outlet or a circuit controlled by a GFCI circuit breaker would be required.
Connect incoming power to the line side of GFCI outlet and plug Jacuzzi into the outlet. Must be on a dedicated circuit. If it has a pump and heater then each one must be on dedicated GFCI protected circuit.
Yes, you install a GFCI on a 2 wire circuit.
Not if the GFCI breaker is supplying the circuit you are wanting to put the GFCI receptacle into.
It could be that the bathroom circuit simply has more on it so the hair dryer is pushing the circuit beyond its limit. In a typical bathroom, properly wired, this would not be the case. But if there are lights on the circuit other than in the bathroom (it would take a lot of lights for this to be a problem), or if there is a source of heat in the bathroom that is on, this may be where your problem is.