Cap attachment for small neck plastic bottle of liquid

In combination with a plastic bottle of liquid, the bottle having a small threaded neck with an open end:

• a cap comprising:
• a (flat) horizontal disc having flat parallel upper and lower surfaces, said disc having a peripheral socket in which said open end is inserted, the open end being held within the socket, the socket being a vertical hollow cylinder open at its bottom ends, the cylinder having an inner wall with means threadedly engaging said threaded neck, said disc having a first narrow rectangularly elongated slot centered therein;
• a vertical hollow spout integral with the disc, the spout having open upper and lower ends and having an inner wall, the spout tapering downwardly and outwardly to the disc, the lower end of the spout having an opening the same size and shape as said first slot and being coincident therewith, the upper end of the spout having a second narrow rectangularly elongated slot centered on the first slot;
• and
• a flat horizontal member parallel to said disc, said member being disposed in the spout between the upper and lower ends and sealed peripherally to the inner wall, said member having a third narrow rectangularly elongated slot centered on the first slot, the third slot being much narrower than either one of the first and second slots.