Abstract: A portable container for cooling or heating liquids stored therein. The container comprises a hollow body and a releasably secureable lid assembly therefor. The container body includes a threaded mouth onto which the lid assembly is secured to seal liquids within the container body. The lid assembly includes thermoelectric chiller/warmer means having thermally conductive immersion means extending downward from the lid for immersion within the liquid in the container body, Peltier type thermoelectric means in intimate thermal engagement with the thermally conductive immersion means and with heat dissipating means. An electrical means for connecting the thermoelectric means to a source of direct current and for enabling the polarity of the direct current provided to the thermoelectric means to be reversed so that the thermally conductive immersion means can either heat or cool the liquid disposed within the container body.