Abstract: There are provided a system and a method for implementing a normally-closed but openable closure device (20) for a fluid-retaining container (10) having a container orifice (11). The closure device prevents unintentional spilling of substance out of an opening, which is disposed in fluid communication with the orifice, by urging a lid (32) to seal the opening closed. For retrieval of substance out of the container, a member of a flow control implement, such as pertaining to a faucet (60) for example, is introduced into the closure device. The introduction of the implement forces the lid open, and allows retrieval of substance out of the container.