2009 International CXT - water in the power steering

My Stupid brother added water in my perodua Alza power steering system and all the oil is gone and I have no idea what to do

Have you started or driven it since water was added? If not have it towed to a service garage and have them change the fluid out. If you have started/driven the car you might as well drive it to the garage, then have them change the fluid. You MIGHT get lucky and no damage was done, but who knows.