Blackcat
You can pick up a pump from most caravan shops. Look on the outside just past the battery box compartment there should be a rectangular plastic cover, lift this up and you will see where a plug fits this is for the intake of water and supply for 12 volt electrics. The pump and plug are conected with a double tube, the pump is put into the water container other end plugged in. Operation is by micro switch under the taps.
Hope I have explained this properly My van is a 1994 Jubilee Herald.
Trevor