i'm happy to say that our household has kicked the water bottle habit! we no longer buy water bottles in bulk anymore. we drink from the filter and fill our reuseable bottles (as seen below) when we leave the house. the hubs has his own nalgene bottle he carries around and i use a water tumbler at work and refill from our water filtering system in the break room.
it took almost a year but i can now safely say that we no longer buy bottled water at home. we are still guilty for buying a 6-pack of bottled water when we're on vacation. i like to justify it by saying that we don't have an adequate method of sanitizing the bottles unless we bring along dishwash soap with us! the thought of washing our bottles in a hotel bathroom makes me ill, considering that the hotel rooms aren't properly cleaned.