 Filling glass with liquid that will be subjected to freezing and thawing is not a good idea, but is useful if the glass is protected from temperature extremes.When the bottles are filled with a (dark) liquid, or other dark material, the wall can function as a thermal mass, absorbing solar radiation during the day and radiating it back into the space at night, thus dampening diurnal temperature swings.This may be a pleasant feature for colder climates - but can turn a room into an oven in hotter climates.