certain drinking straw device embodiments comprise an inner tube having a hole along its length and an actuator for actively introducing a gas or fluid through the hole into a liquid flowing through the inner tube . in an embodiment , the actuator stores and releases a pressurized gas . in some embodiments , the actuator stores and releases a second liquid or gel . in some embodiments , a device comprises a non - pressurized gas or fluid substance introduction mechanism , which , when activated , allows the gas or fluid substance to enter and be mixed with a liquid flowing through the inner tube .