Removable cap assembly

A removable cap assembly comprising:

• a cap having a curved side wall having an inner surface and an outer surface, a top portion extending from said curved side wall, a boss extending perpendicularly from said top portion in the shape of an inverted trapezoid, said boss having a bottom and a top, a first circumferential rib extending perpendicularly from said top of said boss, said boss and rib defining an opening in said cap, said opening having a width and a height;
• a stopper dimensioned to seal said opening, said stopper having an inverted trapezoidal shape complementary to said boss, said stopper having a hole therein configured to allow a fluid to flow therethrough, said stopper being maintained in said cap by said inverted trapezoid shape of said boss, said stopper including a disc shaped base, a cylindrical wall portion extending from said base, a first groove in said base surrounding said wall portion, said first groove dimensioned to receive said bottom of said boss;
• and
• a bottle having a mouth portion with an inner surface and an outer surface, said outer surface having a first at least two threads disposed thereon corresponding to a second set of threads, disposed on said inner surface of said side wall of said cap, so that when said cap is screwed on to said mouth of said bottle, a compression seal is formed along an entire circumference of said cap and said bottle with less than a full turn of said cap.