3. Water Bottle Ice Cubes

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$6.99 on amazon.com

Whether you bring a water bottle to work or carry it during your morning jog, it can help to have ice cubes inside of it to keep it cool. Since "normal" ice cubes won't fit inside of the hole at the top of your drink, you can create thin ice cubes by buying this special tray. It'll make your drinks taste all the more refreshing.

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