The portable bottle system includes a vessel sleeve, a chamber assembly, a shell attachment, and an adapter. The vessel sleeve has a top rim and a bottom rim with external threads. The external threads sealingly engage threads on the brim of the chamber assembly. A cartridge or wedge section is loaded into the chamber assembly to deliver additives to dissolve into the liquid in the system. The chamber assembly also has a capped end to define an interior volume, so that a cup is formed. The shell attachment has an upper rim and a lower rim. The lower rim stacks on top of the top rim of the vessel sleeve, forming a water tight seal and the bottle shape of the shell attachment and the vessel sleeve. The adapter removably attaches the shell attachment to release or to receive liquids. The adapter may have a nipple, straw, or inlet hole.