In general , it is a good idea to try to obtain rainwater wherever it is available, ie wherever tanks are evident on public buildings or private houses. Most farmers are happy to provide drinking water. Bottled water is readily available in large supermarkets. Ground water will not be safe anywhere. However, some of these small shops are clearly struggling in the face of depopulation.
Supermarkets often have liquor stores attached.
There are plenty of opportunities for free camping on quiet side roads and unsealed stock routes leading away from the sealed roads. Use wood sparingly and observe all fire precautions and bans. Most camp site managers seemed bike friendly, offering some discount on car-based tariffs. Caravan sites were between one and four star, for generally the same price. Indoor accomodation is available at pubs, generally of a vary basic standard, and often smelling unpleasantly of cigarette smoke.