Hydrating your body isn’t like filling up a gas tank when it’s on empty. You can’t just go home after work drink 2 liters and rehydrate. It’s a process just like anything in proper fitness and health. You need to be hydrating all day long. Your body loses about 2 liters everyday just from breathing. To stay properly hydrated drink your fluids throughout the day. Stay away from sugar and fruit juices.
Water is your best option!