The phrase "to freeze the water" means to turn the liquid water into ice by lowering its temperature below freezing point, causing it to become solid. Full definition
If the polar regions the ice is melting the massive increase in freezing water into the worlds ocean currents makes the climate colder. (hubpages.com)
If it's a hot day, take along a couple of frozen water bottles to keep your rabbit cool in case your air conditioner breaks or you get stranded out in the heat. (smallanimalchanel.com)
Load the cooler with frozen water bottles to keep things cold and keep you hydrated on the road. (bostonmamas.com)