We're seeing record-high temperatures for fall, which means that staying hydrated is more important than ever. After all, one-third of the human body is composed of water—and while we can survive a month without food, going without water is lethal after just four days.

Water is necessary for almost every function of our body—and while the 8 glasses a day rule may be a “quasi-fact” according to Dr. Michael Hartman, PhD , there are guidelines: about 11.5 cups for women and 15.5 cups for men. If you're not hitting these goals, you may be dehydrated, which leads to fatigue and headaches, low blood pressure, muscle cramps and skin problems, and much more.

But it's not only beverages like water that can help with hydration. Your diet can be a source of water, too. Here are 10 foods to he

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