Under the bonnet you will find the screen wash bottle, to which you should regularly add a good quality screen wash liquid and water mix. It is essential that you can always be able to clean your windscreen.
Secondly check the coolant level.
Coolant is the liquid, which runs around the engine to help keep it cool. There is a reservoir under the bonnet of the car, the coolant is made up of water and anti-freeze, check your handbook for details of this mixture.