You cannot shoot pictures without these! To know how to choose your camera and lenses, click here
A steady tripod, it provides a steady support for your camera.
A torch is a must for night photography, especially when you are shooting in the country side. It helps you to find your way, and change your lens in dark.
Long exposure (which consumes more battery) is required during night photography, so you need spare batteries to keep your camera running.
A shutter cord is a useful tool during night photography. It avoids shaking when you press the shutter button on the camera, this device also helps you to keep the shutter open while Bulb shutter.
A swiss army knife, it will be used in case of emergency.
Other things like water and food are important as well!