Abstract: A container assembly is provided for use in monitoring consumption of a liquid from the container assembly. The container assembly includes a body constructed and arranged to hold a liquid. The body has a base portion and an opposing top portion. The top portion permits liquid to be supplied into and to be removed from the body. The base portion has a skirt member. Indicator structure is operatively associated with the skirt member for rotational motion relative to the body into a plurality of different positions. Indicia is disposed on the body to indicate consumptive uses of the container assembly. Complementary engaging structure is on the skirt member and on the indicator structure for mounting the indicator structure with respect to the skirt member in such a manner that rotation of the indicator structure is possible in one direction and rotation of the indicator structure is resisted in the opposite direction.