The portable water bottle filter turns rain, lake, and river water into drinkable water immediately. Add this to your emergency essentials prepper gear now! The water bottle is ideal for hiking, fishing, hunting, survival, military, foreign travel, and emergency needs. It removes 99.99% bacteria with 0.01micron hollow fiber ultrafiltration membrane and is BPA free. The design of portable water bottle filter is based on comfort and user friendly functionality. The portable water bottle has an inlet that the you can pump water directly into if used with the Portable Mini Water Filter Pump. This would filter the water another time once you drink through the water bottle and save the life of the filter.