A portable beverage preparation device and system for making brews, mixes, and potions on demand by selectively introducing and mixing predetermined quantities of at least one stored, edible, beverage preparation confined in at least one sealed chamber into a portable beverage container containing a predetermined volume of a potable base liquid and having a dispenser means for introducing the at least one beverage preparation into the potable base liquid; wherein the drink container and the at least one sealed chamber are in close physical proximity to each other and separated by at least one thin membrane which, when inwardly perforated by the dispenser means, introduces the at least one beverage preparation into the base liquid. The system of the invention further provides a brewing element and a portable heating unit, the heater element of which fits into the beverage container for heating the liquid.