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By Sandee LaMotte, CNN

Updated 1302 GMT (2102 HKT) September 27, 2021

According to the old rule of thumb, you're supposed to drink eight glasses of water per day (and some experts recommend even more). That can seem like a daunting task on some days, but here's the catch: You don't have to drink all that water. Roughly 20% of our daily H2O intake comes from solid foods, especially fruits and vegetables.<br /> <br />It's still important to drink plenty of water -- especially in the summertime -- but you can also quench your thirst with these 15 hugely hydrating foods, all of which are at least 90% water by weight.<br />
Photos: Foods that keep you hydrated
According to the old rule of thumb, you're supposed to drink eight glasses of water per day (and some experts recommend even more). That can seem like a daunting task on some days, but here's the catch: You don't have to drink all that water. Roughly 20% of our daily H2O intake comes from solid foods, especially fruits and vegetables.

It's still important to drink plenty of water -- especially in the summertime -- but you can also quench your thirst with these 15 hugely hydrating foods, all of which are at least 90% water by weight.
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<strong>Cucumber</strong><br />Water content: 96.7%<br /><br />This summer veggie -- which has the <a href="http://ndb.nal.usda.gov/ndb/foods/show/2945" target="_blank">highest water content </a>of any solid food -- is perfect in salads or sliced up and served with some hummus, says Keri Gans, author of "The Small Change Diet: 10 Steps to a Thinner and Healthier You" and a consultant to Mindbloom, a technology company that makes life-improvement apps.<br /><br />Want to pump up cucumber's hydrating power even more? Try blending it with nonfat yogurt, mint and ice cubes to make cucumber soup. <br /><br /><a href="http://www.health.com/health/gallery/0,,20660118,00.html" target="_blank">Health.com: The best foods for every vitamin and mineral</a><br />
Photos: Foods that keep you hydrated
Cucumber
Water content: 96.7%

This summer veggie -- which has the highest water content of any solid food -- is perfect in salads or sliced up and served with some hummus, says Keri Gans, author of "The Small Change Diet: 10 Steps to a Thinner and Healthier You" and a consultant to Mindbloom, a technology company that makes life-improvement apps.

Want to pump up cucumber's hydrating power even more? Try blending it with nonfat yogurt, mint and ice cubes to make cucumber soup.

Health.com: The best foods for every vitamin and mineral
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<strong>Iceberg lettuce</strong><br />Water content: 95.6%<br /><br />Iceberg lettuce tends to get a bad rap, nutrition-wise. Health experts often recommend shunning it in favor of darker greens like spinach or romaine lettuce, which contain higher amounts of fiber and nutrients such as folate and vitamin K.<br />It's a different story when it comes to water content, though: Crispy iceberg has the highest of any lettuce, followed by butterhead, green leaf and romaine varieties.<br />So when the temperature rises, pile iceberg onto sandwiches or use it as a bed for a <a href="http://www.health.com/health/gallery/0,,20401749,00.html" target="_blank">healthy chicken salad</a>. Even better: Ditch the tortillas and hamburger buns and use iceberg leaves as a wrap for tacos and burgers.