Mineral Water Vending Machine

All water-ATMs are connected to the main server via cloud computing. A decentralized water plant is set up as the main plant that purifies the water through reverse osmosis and a tanker filled with pure water is installed on the top of each ATM. People draw water from these ATMs using smart cards. These smart cards can be recharged at the main treatment plant. Whenever the level of water in any of the tanker reduces a message is sent to the main server automatically and these tanks are again refilled.