Drinking can be obtained from rainwater collection.
Through boiling salt water, if there is an ocean nearby and if a solar power tower is used for energy production.
Water for hygiene
Hygiene may require a lot of water. Dishes, clothes and bodies have to be washed. Rivers, oceans and lakes are the obvious primitive ways.
Water for cooking
Water and automation
Automation in the modern world happens trough tap systems for transport, dishwashers and washing machines.
Rainwater should be collected underground, allowing for a layer of soil.