A fluid storage tank includes a plurality of tank sub-units disposed in an array. Each tank sub-unit of the plurality of tank sub-units has an aperture defined in at least one wall overlapping with another aperture defined in at least one adjacent tank sub-unit of the plurality of tank sub-units. Each tank sub-unit of the plurality of tank sub-units is in fluid communication with a single outlet port for selectively extracting a stored fluid from the tank. Each of the plurality of tank sub-units is in fluid communication with a single fluid fill port.