Subject: Why did my unopened bottle of distilled water implode?

Approximately 1 year ago, I bought a 1 gallon plastic bottle of distilled 
water (normal plastic milk jug).  I put it in the engine room of my boat in 
case I ever needed to top off the batteries.  I never opened it or cracked the 
seal on the top.  The temperature in the engine room varies between 40-100F 
and the humidity changes quite a bit.  When I checked the bottle recently, 
about half the water is gone and the jug has scrunched inwards or imploded.  
Can you explain this?

Re: Why did my unopened bottle of distilled water implode?