The on-pack campaign enables consumers to claim a free swim on weekdays, at one of 468 swimming pools around the UK, by taking a bottle cap to participating venues.
Supplier Coca-Cola Enterprises is revamping the packaging of 50cl packs to feature updated Schwim? Free graphics.
The campaign will run for a year and will be supported by outdoor, press, radio and online activity.
Revenue growth manager Jeremy Payne said: “Consumer research has shown that Schwim? Free activity has helped to increase purchase from 65% to 88%, helping boost sales for retailers?.”