A beverage infusion device for preparing a beverage in a single beverage container (700), comprises housing means (100, 101) and infusion means (200). The infusion means (200) is joined to the housing means by a thread (201). The housing means (100, 101) stores the infusion means (200) inside said housing means and, after said infusion means has been immersed into a fluid in the beverage container (700), permits pulling the infusion means back into the housing means and pressing excess fluid out of said infusion means by means of said thread (201). The housing means (100, 101) is further fitted with slots to fit onto the rim of the beverage container (700) while the beverage is prepared. The infusion means finally comprises a filter bag (200) containing an infusible substance for making the beverage. For total immersion into the fluid in the beverage container and free expansion therein, the device is configured so that the filter bag (200), from said storing position, is suspendable from inside the housing means (100, 101), hanging free therefrom in said thread (201).
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