When you place a water bottle in the freezer, the water inside the bottle freezes and expands. The expansion of water as it freezes can put pressure on the bottle, causing it to slightly deform or change shape. This deformation can create small gaps or cracks between the bottle and the frozen water.
When you remove the bottle from the freezer, the temperature of the surrounding air is usually warmer than the freezing point of water. As a result, the cold bottle surface comes into contact with the warmer air, causing the air to condense and form droplets of water on the bottle's surface.
The presence of those small gaps or cracks in the bottle created during the freezing process allows the condensed water vapor to penetrate into the bottle's exterior. This moisture then condenses on the colder surface of the bottle, resulting in the formation of water droplets or frost on the outside.
Additionally, the temperature gradient between the frozen water inside the bottle and the warmer air outside can also cause moisture from the surrounding air to condense on the cold surface of the bottle, further contributing to the wetness.
In summary, the combination of condensation from the surrounding air and the presence of small gaps or cracks in the bottle leads to the outside of the bottle becoming wet when you remove it from the freezer.