A beverage cooling or heating device includes a sealed housing, a first chamber within the housing that contains a thermal agent, a second chamber within the housing that contains an activating agent, for endothermically or exothermically reacting with the thermal agent, and a barrier between the first chamber and the second chamber, wherein the barrier is configured to keep the thermal agent separate from the activating agent, and is further configured to be ruptured upon activation of the device such that the thermal agent and activating agent come into contact with and react with each other. The thermal agent may be a cooling agent, such as urea, and the activating agent may be water. The thermal agent may alternatively be a heating agent.