A lid is disclosed having a spring mechanism that pushes up an activator lever while also lifting up a flow stopper that keeps fluid from the mug and out through the lid. A button in the side of the lid activates the lever. This button can be locked in either the open or closed position. The open architecture allows for easy disassembly and deep cleaning of all of the parts of the lid. Due to the design of the lid, a mug can be filled without having to remove the lid. Similarly, the user does not have to touch any part of the lid from which water flows. This makes the use of this lid more sanitary.