The promotion, through Inferno, is running in independent retail chain Martin McColl and is open to anyone who purchases two drinks. The push is part of a £2.4 million marketing campaign to support a recent rebrand.
Consumers answer a multiple choice question on the card which they text together with a code under the scratch-off panel. Correct entries go into the draw for the car, while anyone making six entries wins a pocket Scrabble game.
"The promotion aims todrive rate of sale and repeat purchase," said Susanne Judd, Britvic channel manager, convenience & impulse.
A press and radio campaign launches this month featuring the new advertising tagline 'Your brain is 75 per cent water - keep it topped up ... stay drenched'.
Bottled water is the third largest sub-category in take-home, worth £643 million in sales in 2006 with 11 per cent year on year growth, according to Britvic research.