Using this water bottle is a breeze. First, unscrew the leak - proof lid and fill it with water. Then, use the time marker on the side to keep track of how much water you've drunk throughout the day. When taking it on the go, just make sure the lid is tightly closed to prevent spills. As for maintenance, wash the bottle regularly with mild soap and warm water. Avoid using abrasive cleaners that could damage the time marker or the bottle's surface. Also, don't put it in the microwave or dishwasher. This way, your water bottle will serve you well for a long time.