Disclosed herein is an aircraft water supply system. The water supply system comprises a water tank (10) for storing potable water; and two or more faucets (26) that are each connected to the water tank and configured to dispense the potable water on demand in response to a user actuating the faucet. Each of the two or more faucets includes a respective filtering unit (22). In embodiments the filtering units are integrated within the faucets and comprise three stages of filtering, namely (i) a coarse filtering stage (30); (ii) a first filtering stage (32) comprising a hollow fiber filter and/or one or more ion exchange resin filters; and (iii) a second filtering stage (34) comprising activated carbon.