Energy drink brand Isostar is pointing out why it is better than water in a new poster campaign. Posters for the drink claim that water is H2slOw' when it comes to rehydrating the body and promises Isostar hydrates you faster'. Rolling out at sites inside the M25 London belt, the ads come as a new banana flavour joins orange and lemon flavours in the ready-to-drink and powdered formats. {{P&P }}