Abstract: A cap assembly for a bottle including a cap and a fitment. The cap includes a tubular side wall extending from an upper lateral wall to an open lower end. An inner surface of the tubular side wall includes a thread. An inner surface of the upper lateral wall includes a retaining extension. The fitment includes a side wall extending from an upper lateral surface to an open lower end. The upper lateral surface of the fitment includes a central aperture having a shape that is reciprocal to a shape of the retaining extension of the cap. The fitment is selectively secured within the cap by directly engaging the central aperture of the fitment with the retaining extension of the cap. The cap and fitment of the cap assembly are secured to a bottle simultaneously. The cap is threadedly secured on the bottle, thereby securing the fitment to the bottle.