An activity-areatime-frame weighting table indicates the likelihood of where a user is most likely to be in a certain time frame, and weighting is set depending on times frames, which are divided into weekdays and weekends. A refill unit for refilling a liquid dispenser system comprises a container for holding a supply of liquid and a pump connected to the container. The holder, the hammer and the drill bit are connected head to tail along a longitudinal axis of a drill string with the holder at a proximate end of the drill head and the drill bit at a distal end of the drill head.