Many people get their water from fruits, such as apples, watermelons and berries. One piece of fruit, depending on the size, can count for as much as half of a glass of water. The added benefit of fruit is that in addition to helping to hydrate you, fruit can add healthy amounts of vitamins and minerals to your core diet.
Fruit also fills the stomach and energizes you. Because fruit contains very few calories, it is a good food to fill up on. However, fruit does contain fructose, which is a type of sugar. Fructose will spike the level of sugar in your blood stream, which will give you energy. Yet, if that energy is not consumed readily, the fructose will turn to fat (if only a small amount of it.)
So, enjoy your fruits, just do it in moderation!