
The Drink, Think, Win campaign, which runs for the next three months, will offer the opportunity to win a range of prizes including iPhones and video recorders.
To win consumers are required to go online to a Drench microsite and enter a unique on-pack code. They will then be asked to play a 'mental agility' game - lack of sharpness is one of the key indicators of dehydration - before finding out if they have won.
Drench's move to capitalise on the health benefits of staying hydrated follows last month's launch of the , a trade body set up by Nestle, Danone and Highland Spring to promote bottled water.
The poster campaign focuses on three benefits of staying hydrated: keeping gums clean and healthy, maintaining a sharp mind, and improving performance levels during exercise.