Of course, with the heat you need to Drink more fluids. Equation is mathematics and should be strictly respected. But not all drinks are the same. For summer thirst you have to choose.
Water is the main ingredient that is always necessary for our body but also containing a bit of calories. Try to make tea or fruit juices at home, as the industrial ones are very sweet.
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Water is always the best choice of all seasons, has less calories and suck thirst. It can be natural, or easily sparkling, according to our tastes. Moreover it helps and weakens.
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Cold Tea - Prepare at home to avoid excess sugar. Just enough boil in the water, let it cool and do not add sugar. Save it in the fridge.
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Fruit Juices - Just like tea, prepare home-made fruit drinks as the industrial ones are very sweet. Whether smoothie, or squeezed juices or fruit extracts.