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It?s hot out there. A cold cup of joe--one that doesn?t cost $5 and require waiting in a long line--sure would be nice to tote along on your morning commute.

Now there?s a coffee mug (or in this case, bottle) that makes brewing a breeze: the Primula Cold Brew Bottle ($20).

Here's how it works: Just add four tablespoons of your favorite ground coffee to the filter in the base, and fill the bottle almost to the top with cold water. Give it a shake, then put it in the fridge and let it sit overnight.

The next morning, you?ve got 20 ounces of cold brew, with room for milk and ice cubes, that you drink right out of the same bottle. Plus, later in the day, you can fill it with water to stay hydrated in the heat.

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