Callie's First Chore

Since we live in the bitter cold Minnesota with dry air, we sleep with a humidifier in our room at night (Callie has one as well). Almost every morning after we wake up, Callie goes in our room and takes the water tank off of the base of the humidifier. We need her to do this every day so that we can clean out the tank for us to use the next night. We have called this her first chore. She doesn't seem to mind the work at this point.