As everyone stated good set of tires and proper alignment of your car.
Best of all excercise caution and good logic when driving on wet roads.
Make sure the VDC is on.
Ease up on the gas pedal and listen to GP.
Btw the BRZ is not like anything compared to the Z in terms of hp and torque.
The Z can bite you back like a Doberman the BRZ is a pussy cat. No offense.