Abstract: A modular supplement beverage container for storing and mixing a powder supplement and a liquid includes a lid that is removably connected to an upper chamber, and a filter that is removably disposed between the upper chamber and a lower chamber. The filter including a plurality of cutters for breaking clumps of supplements into a fine powder, and the lid including a spout. Each of the lid, upper chamber, filter and lower chamber including threaded elements for securing the elements together in a removable and watertight manner.