Aquarius, Japan's No. 1 Isotonic drink and its the official partner for the Olympic worldwide partner. Aquarius believes that you play and perform at your best when you're fully hydrated, when your reserves are full and all your energy is on tap. With ingredients like Electrolytes, Vitamin Bs and Guarana, Aquarius helps you play on. Aquarius is an isotonic beverage that helps to replace the body fluid lost through sweat due to heavy physical activity.