Top Up A Half-Filled Frozen Bottle For Quick Cold Water

Freezing a mostly-full bottle of water so it thaws by the time recess rolls around is a school lunchbox staple. But Lifehacker reader Rob suggests that a half-filled bottle of frozen water can be even more useful.

Here's Rob's approach:

Here's a tip I've been using so I always have cold water for sports or whatever. I one third fill large water bottles then lay them down on their sides in the freezer. When it's time to hit the court/field/track pull one out and fill it with water. The larger surface area of the ice seems to help it melt faster and chill the water while keeping it cold over a long period.

Make sure you allow for the water expanding a little as it freezes and this could be a very handy tactic. Thanks Rob!


    Been doing it for years. If you want it to last all day, stand it up while freezing - less surface area will slow the rate of warming. Both methods are negated once the ice dislodges and the water can circulate around all sides of the ice though.

    On the other side of the health coin - when cooling room temperature beer stubbies in an esky, and you want them cold as quickly as possible, top your esky up with water. The ice won't last half as long of course, but the water will act as a vastly superior heat-conductor to get that cold goodness into your amber-ale as fast as possible.

    A glass FULL of ice, covered in boiling water is also a very fast way of getting chilled water to drink.

      Not a very good idea Robert. Glass cracks very easily under rapid temperature change stress.

      And I rarely hit the track with a kettle and readily available power source.

        And I rarely hit the track....

    Quickest way to chill a beer is to put it in an eski full of ice, water and salt. the salt lowers the freezing temp of the ice thereby speeding up the cooling of your beer.

    Of course this also means your ice disappears much quicker... but is the fastest way next to spraying with CO2. Can chill a beer in 5 minutes.

      The salt comment is true, but in practice I've found any effect it has is negligible.

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