A water vending machine (water dispenser) is
a fully automated system for purifying and dispensing drinking water into the customer's container, connected to the water supply, equipped with various filters (mechanical, carbon, reverse osmosis, mineralizer) to bring the water up to drinking standards. These machines have a vandal-proof housing, accept various payment methods (coins, bills, cards, QR codes), and provide round-the-clock access to clean water, often with heating/cooling functions, making them convenient for installation both indoors and outdoors. 
Main components and operating principle:

Connection: The machine is connected to the central water supply.
Filtration system: Water undergoes multi-stage purification (mechanical filtration, chlorine removal, reverse osmosis to remove 99.8% of impurities), remineralization, and UV disinfection.
    Capacity: Inside there is a tank for purified water and a dispensing system.
Payment receiver: Supports various payment methods, allowing you to obtain a certain amount of water.
    Display: Shows information about the cost and volume.
Housing: Durable, often made of stainless steel, with anti-vandal protection, capable of operating at low temperatures (-30°C).