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A layering device for producing a layered drink in a drinking container may include a hollow cup with an open top. A circumferential sealing rib may be formed on an exterior surface of a wall of the cup. An opening through the wall may be positioned axially between the rib and the open top of the cu

A layering device for producing a layered drink in a drinking container may include a hollow cup with an open top. A circumferential sealing rib may be formed on an exterior surface of a wall of the cup. An opening through the wall may be positioned axially between the rib and the open top of the cup. An outer diameter of the rib may engage with an interior surface of the drinking container.

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1. A device in combination with a drinking container for producing a layered drink comprising: a hollow cup with an open top;a lower circumferential sealing rib formed on an exterior surface of a wall of the cup, an outer diameter of the lower circumferential sealing rib designed to engage with and

1. A device in combination with a drinking container for producing a layered drink comprising: a hollow cup with an open top;a lower circumferential sealing rib formed on an exterior surface of a wall of the cup, an outer diameter of the lower circumferential sealing rib designed to engage with and seal against a tapered interior surface of the drinking container; andan opening through the wall of the cup positioned axially between the lower circumferential sealing rib and the open top of the cup. 2. The device of claim 1 wherein the wall of the cup is funnel shaped. 3. The device of claim 1 further comprising an upper circumferential rib formed on the exterior surface of the wall of the cup designed to engage with and seal against the tapered interior surface of the drinking container and positioned axially between the open top of the cup and the opening through the wall of the cup. 4. The device of claim 1 wherein the opening through the wall of the cup comprises two slots positioned diametrically across from one another. 5. The device of claim 1 comprising food grade semi-rigid plastic. 6. Apparatus for layering liquids in a drinking container comprising: the drinking container having a tapered interior surface;a hollow cup with an open top;a lower circumferential sealing rib formed on an exterior surface of a wall of the cup and having an outer diameter smaller than a maximum interior diameter of the drinking container and larger than a minimum interior diameter of the drinking container, the outer diameter of the lower circumferential sealing rib designed to engage with and seal against the tapered interior surface of the drinking container; andan opening through the wall of the cup being positioned axially between the lower circumferential sealing rib and the open top of the cup. 7. The apparatus of claim 6 further comprising an upper circumferential rib formed on the exterior surface of the wall of the cup designed to engage with and seal against the tapered interior surface of the drinking container and positioned axially between the top of the cup and the opening through the wall of the cup. 8. The apparatus of claim 7 wherein the lower circumferential sealing rib and the upper circumferential rib are spaced apart axially to form a containment region when the cup is inserted in the drinking container. 9. The apparatus of claim 8 wherein the containment region is provided with an air vent through the wall of the cup. 10. The device of claim 3 wherein the lower circumferential sealing rib and the upper circumferential rib are spaced apart axially to form a containment region when the cup is inserted in the drinking container having a tapered interior surface. 11. The device of claim 10 wherein the containment region is provided with an air vent through the wall of the cup. 12. A method for making a layered drink comprising the steps of: inserting a hollow cup with an open top into a drinking container with a tapered interior surface;engaging and sealing a lower circumferential sealing rib of the hollow cup against the tapered interior surface of the drinking container;pouring fluid into the open top of the hollow cup; andreleasing the fluid from the hollow cup into the drinking container by raising the hollow cup out of the drinking container so that the lower circumferential sealing rib of the hollow cup disengages from against the tapered interior surface of the drinking container so that the fluid flows through at least one opening through the wall of the cup being positioned axially between the lower circumferential sealing rib and the open top of the cup and downward from the hollow cup around the lower circumferential sealing rib and onto the tapered interior surface of the drinking container. 13. The method of claim 12 including: providing an upper circumferential rib formed on the exterior surface of the wall of the cup;engaging and sealing upper circumferential rib against the tapered interior surface of the drinking container and positioned axially between the top of the cup and the at least one opening through the wall of the cup. 14. The method of claim 13 including: spacing the lower circumferential sealing rib and the upper circumferential rib apart axially thereby forming a containment region when the cup is inserted in the drinking container. 15. The method of claim 14 including: allowing air to pass out of the containment region through an air vent through the wall of the cup as the fluid enters the containment region. 16. The method of claim 12 including pouring the fluid into the holder to fill the holder up to a fill line.