The invention relates to the food industry. A liquid product is treated and purified being passed through a mixture of sorbing components confined between filtering materials. Each portion of vodka poured from a bottle into a drinking vessel prior to be consumed is treated and purified by the consumer himself by pressing it from the bottle at an optimal flow rate through a primary filtering material, sorbing agent(s) and a secondary filtering material, which are placed in a cartridge body, using air pressure inside the bottle produced, as necessary, by means of a small-sized air pump which is arranged outside of the bottle in a body and is connected to an electrical micromotor.