And colorless, flavorless and nutritionless water is a neutral PH drink both "economical" and "practical." It won't add to your calorie intake or do the ill any harm. It's of help if you're constipated, on a diet or have hemorrhoids.
而無色、無味、無營養的白開水，既不會增加熱量，又屬中性，對已有疾病的人也無害，是最「經濟」、「實惠」的飲品。