Go to profile.
Click on the "bottles" tab
Click on your bottle.
Click on "Recalibrate Bottle" underneath the map
Completely empty your bottle, screw down the cap and place bottle on flat stable surface.
Press the recalibrate button.
Fill your bottle completely, screw down the cap and place bottle on flat stable surface. After 10 seconds drink normally.**
**The recalibration requires the bottle to be filled up completely for 10 seconds to set the max level on the sensor (24 oz). If you only filled the bottle half way (12 oz), the sensor will think that is a full bottle and double the amount of water since it will think that 12 oz is actually 24 oz, and most likely ignore the top half of the bottle.