Photo: Courtesy of Water Your Body

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Fight dehydration, one of the top causes of ER visits during warm weather, with this convenient water consumption tracker. Input specifics about yourself and your location (are you pregnant? at a high altitude? in a dry climate?), and you'll get a personalized H2O goal. Sometimes your body may need more water, especially on hot days or when you're more active.

Bonus feature: You can set reminders if you want to be pinged when it's time to drink up.