Popsugar Fitness Healthy Eating Tips Best Foods for Hydration These 21 Fruits and Veggies Will Keep You Hydrated All Summer June 19, 2018 by Christina Stiehl View On One Page Photo 1 of 21 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Lettuce Lettuce is 95-percent water per volume, and clocks in at just five calories per cup, shredded. Use it to make plenty of healthy salads this Summer. Previous Next Start Slideshow Healthy Eating TipsHealthy LivingFruitsVegetables