Abstract: An emergency water reservoir apparatus for providing a ready water reserve for extinguishing fires at a location such as a residence includes a water storage tank having an interior reservoir in fluid communication with a water hydrant valve. A water intake conduit in fluid communication with an established water supply and the interior reservoir permits delivery of water into the water tank from the established water supply system. Included at the reservoir end of the water intake conduit is a water intake cut-off device and an anti-siphon valve device. A water pump pumps water from the interior reservoir to the water hydrant valve. An infusion pump device with an infusion reservoir member and an adjustable infusion dispensing device provides infusion chemicals into the water passing from the interior reservoir to the water hydrant valve. An electrical power generator is included to provide backup power to the water pump and the infusion pump device when the location's power supply is cut off.