Ok I bought this caravan yesterday and have been trying to work out how to use it.I think I have worked out where the electric cable goes so now need to buy one. With the water I guess i need to buy some kind of container. There are taps inside and tubes. The guy I bought it from said the pump had been replaced last year and it had hot water but I can't work out how to use it. On the outside there is a pull down flap that says use drinking water on it do I need to buy a container to fix there. How does it pump it up to come out of the taps?