A system comprising: a central server (120; 440) that comprises an application program interface configured to receive, via an internet connection, prepayment information provided to one or more electronic payment systems by one or more mobile devices, wherein the central server (120; 440) is configured to process prepayment information to credit accounts that are each associated with one of a plurality of water supply outlets (140; 300; 450); a gateway (130; 360; 400) for information about delivery of amounts of water at water supply outlets (140; 300; 450) to consumers consistent with values held in accounts associated with the water supply outlets (140; 300; 450), the gateway (130; 360; 400) comprising a transceiver to communicate with the water supply outlets (140; 300; 450), one or more transceivers to communicate over a cellular network (166; 442) with the central server (120; 440), and storage for a) commands that are received from the central server (120; 440) and are sent to the water supply outlets (140; 300; 450) to deliver controlled amounts of water based on value held in the accounts, and b) water flow volume signals that are received from the water supply outlets (140; 300; 450) and are sent to the central server (120; 440); and a plurality of water supply outlets (140; 300; 450) for dispensing water, each water supply outlet (140; 300; 450) comprising a valve that is controllable to dispense no more than a specific volume of water, a device to measure water flow volume, and a transceiver to communicate wirelessly through a communication network different than the cellular network that does not incur a cellular network charge (168; 362; 452) to receive, from the gateway (130; 360; 400), one or more commands generated by the central server (120; 440) for controlling the valve to dispense the controlled volume of water and to send water flow volume signals from the measuring device for processing by the central server (120; 440). a central server (120; 440) that comprises an application program interface configured to receive, via an internet connection, prepayment information provided to one or more electronic payment systems by one or more mobile devices, wherein the central server (120; 440) is configured to process prepayment information to credit accounts that are each associated with one of a plurality of water supply outlets (140; 300; 450); a gateway (130; 360; 400) for information about delivery of amounts of water at water supply outlets (140; 300; 450) to consumers consistent with values held in accounts associated with the water supply outlets (140; 300; 450), the gateway (130; 360; 400) comprising a transceiver to communicate with the water supply outlets (140; 300; 450), one or more transceivers to communicate over a cellular network (166; 442) with the central server (120; 440), and storage for a) commands that are received from the central server (120; 440) and are sent to the water supply outlets (140; 300; 450) to deliver controlled amounts of water based on value held in the accounts, and b) water flow volume signals that are received from the water supply outlets (140; 300; 450) and are sent to the central server (120; 440); and a transceiver to communicate with the water supply outlets (140; 300; 450), one or more transceivers to communicate over a cellular network (166; 442) with the central server (120; 440), and storage for a) commands that are received from the central server (120; 440) and are sent to the water supply outlets (140; 300; 450) to deliver controlled amounts of water based on value held in the accounts, and b) water flow volume signals that are received from the water supply outlets (140; 300; 450) and are sent to the central server (120; 440); and a plurality of water supply outlets (140; 300; 450) for dispensing water, each water supply outlet (140; 300; 450) comprising a valve that is controllable to dispense no more than a specific volume of water, a device to measure water flow volume, and a transceiver to communicate wirelessly through a communication network different than the cellular network that does not incur a cellular network charge (168; 362; 452) to receive, from the gateway (130; 360; 400), one or more commands generated by the central server (120; 440) for controlling the valve to dispense the controlled volume of water and to send water flow volume signals from the measuring device for processing by the central server (120; 440). a valve that is controllable to dispense no more than a specific volume of water, a device to measure water flow volume, and a transceiver to communicate wirelessly through a communication network different than the cellular network that does not incur a cellular network charge (168; 362; 452) to receive, from the gateway (130; 360; 400), one or more commands generated by the central server (120; 440) for controlling the valve to dispense the controlled volume of water and to send water flow volume signals from the measuring device for processing by the central server (120; 440).