The campsite in Tenterden is a field behind the railway. There is no mains water supply to the field or even adjoining land and never has been. The cost of installing a mains supply would be well into five figures. We had an arrangement with a near by garage but that is now closed and demolished. No drinking water is available outside the railway only water for washing trains! Water is available in town. This is all made clear on the website and in our letters. See the following link.
http://btckstorage.blob.core.windows.net/site4068/News%20letters/Camping%20for%202012.pdf

The farmer whose field it is will give us a tanker of water but unless the tank is specially treated and checked by the powers that be and it is changed every 24 hours we cannot designate it as drinking water. It can be used for flushing loos, etc.

We could bring in certified drinking water from a contractor but that would cost several thousand pounds per day and we would have to increase the cost of camping several fold over to cover it and no one would pay that as it would be dearer than a five star hotel.

There are hotels and B&Bs in Tenterden if you want more comfort and a commercial campsite at Bethersden. You pays your money and takes your choice.