Abstract: A compact filtering and additive delivery system which is readily adaptable to a portable container, such as a sports bottle, and receives a modular additive container for the metered delivery of additive, such as flavor concentrate, to a stream of base liquid as the base liquid is drawn or dispensed from the container. The modular additive container configuration on the delivery system allows a consumer/user to experience different additives, such as different flavors or supplement compositions, for a given supply of base liquid, such as water, stored in the container. The system may be readily used with off-the-shelf containers, such as disposable water bottles. An additive container configuration provides modular additive delivery system as described herein.

Abstract: An adjustable additive cartridge that provides adjustable metering of additive to a base fluid as the base fluid is flowing through the cartridge. A spout is mounted for limited rotation within a base element of the cartridge. Rotation of the spout results in varying degrees of flow of additive into a base fluid flow path through the cartridge. The cartridge may be used with a portable beverage container, such as a sports bottle or off-the-shelf water bottle. The supply of base fluid in a container used with the cartridge may be kept in an unmixed, pure state, and other cartridges, each having different additives (i.e., flavors) may be used interchangeably with the same base fluid supply. The cartridge allows a consumer/user to experience different additives, such as different flavors or supplement compositions, for a given supply of base liquid in a single container. A check valve on the cartridge prevents backflow of the base fluid.