A water supply system for an aircraft comprising a central water tank, a plurality of pieces of consumer equipment, a conduit system connecting the central water tank to the plurality of pieces of consumer equipment, at least one buffer for storing liquid at a consumer pressure exceeding an environmental pressure comprising a storage volume for holding the liquid and a gas, a pressurization means configured for increasing a pressure of the gas in the storage volume to an operating pressure or maintaining the pressure of the gas in the storage volume at the operating pressure when liquid is or has been drained from the storage volume so that the pressure of liquid in the storage volume is increased to the consumer pressure, and a ventilation means configured for reducing the pressure of the gas in the storage volume back to the operating pressure or maintaining the pressure of the gas in the storage volume at the operating pressure when the storage volume is filled with liquid so that the pressure of the liquid in the storage volume is reduced to the consumer pressure, wherein at least one consumer equipment of the plurality of pieces of consumer equipment is associated with a buffer of the at least one buffer and wherein the at least one buffer is configured to provide water to each associated consumer equipment at the consumer pressure, and a central pressurization means for feeding water from the central water tank to the liquid compartment of the at least one buffer at a pressure exceeding the consumer pressure. a central water tank, a plurality of pieces of consumer equipment, a conduit system connecting the central water tank to the plurality of pieces of consumer equipment, at least one buffer for storing liquid at a consumer pressure exceeding an environmental pressure comprising a storage volume for holding the liquid and a gas, a pressurization means configured for increasing a pressure of the gas in the storage volume to an operating pressure or maintaining the pressure of the gas in the storage volume at the operating pressure when liquid is or has been drained from the storage volume so that the pressure of liquid in the storage volume is increased to the consumer pressure, and a ventilation means configured for reducing the pressure of the gas in the storage volume back to the operating pressure or maintaining the pressure of the gas in the storage volume at the operating pressure when the storage volume is filled with liquid so that the pressure of the liquid in the storage volume is reduced to the consumer pressure, a storage volume for holding the liquid and a gas, a pressurization means configured for increasing a pressure of the gas in the storage volume to an operating pressure or maintaining the pressure of the gas in the storage volume at the operating pressure when liquid is or has been drained from the storage volume so that the pressure of liquid in the storage volume is increased to the consumer pressure, and a ventilation means configured for reducing the pressure of the gas in the storage volume back to the operating pressure or maintaining the pressure of the gas in the storage volume at the operating pressure when the storage volume is filled with liquid so that the pressure of the liquid in the storage volume is reduced to the consumer pressure, wherein at least one consumer equipment of the plurality of pieces of consumer equipment is associated with a buffer of the at least one buffer and wherein the at least one buffer is configured to provide water to each associated consumer equipment at the consumer pressure, and a central pressurization means for feeding water from the central water tank to the liquid compartment of the at least one buffer at a pressure exceeding the consumer pressure.