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just to improve on this idea put bottles sideways , only fill every 10th one with water or a small amount in each one place each group in a large thick plastic garbage bag and seal off. Free Cheap insulation!!
i had this idea myself a few years ago , however why put water in them fresh air is a better insulator if you included a small bit of water in each one you would have an automatic sprinkler in case of fire and better insulation and less weight in your ceiling.
Build a Boat!
Fix a Frayed iPhone Cable