During summer, you need water more than any other season. The hot, sweltering heat can easily cause parched lips, dry skin and worse, may cause dehydration. Aside from its hydrating effects, water is also great to drink when losing weight. It is filling at zero calories. Drink water an hour before a meal and youâll end up feeling full. As a result, you will eat less. By filling up on water, not only are you doing your body a favor by hydrating yourself, but you are also cutting back on calories as well.