Abstract: There is disclosed an infuser apparatus for a beverage container. In an embodiment, the apparatus comprises: a perforated basket adapted to receive a flavoring agent therein; a compactor unit sized and shaped to slideably fit inside the perforated basket; a screw operatively connected to the compactor unit and adapted to rotate relative to the compactor unit; and a knob operatively connected to the screw to rotate the screw; whereby, in use, turning the knob actuates the compactor unit to move along the length of the screw to compress the flavoring agent received in the perforated basket, thereby to infuse flavor into the beverage container.