Sponge Bottle Cap

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This is a sponge bottle cap that fits standard sized soda bottles. It should screw onto your typical 20oz bottle, 2-liter bottle, water bottle, or even the mini soda bottles as pictured.

All it requires is an empty clean soda bottle, a slightly thick sponge, and optionally a small rubber-band (creates a nice seal). The sponge should be cut into a pyramid-like shape with the top cut off. The larger portion of the sponge (bottom of the pyramid) should be about twice the size of the square top of the opening. The opening has a small lip and with the bi