Abstract: A cap device of container includes a seat portion and a flushing portion. The seat portion includes an inner circular wall and a bottom wall. The flushing portion has a circular column. The circular column has a lower cutting portion, two inclined cutting portions and a stopping portion. The lower cutting portion has several teeth, which are separate from each other. When the flushing portion is pressed downwards, the lower cutting portion cuts open the bottom wall and the two inclined cutting portions cuts open the peripheral area of the bottom wall until the stopping portion stops the cutting. Therefore, the additive contained in the space may be fall down to the bottle.

Abstract: A bottle cap includes a cap seat and a cap. The cap seat has a receiving space confined by an inner tubular wall and a bottom wall. The cap is disposed within the inner tubular wall, and has a top panel and a tubular cutter body. The tubular cutter body has a beveled bottom open end that has a cutting end and a pushing end. When the top panel is pressed, the cutting end cuts the bottom wall, and the pushing end pushes a portion of the bottom wall so that the bottom wall moves away from the cutting end. Preferably, the bottom wall and the inner tubular wall are formed as one piece.