If the grape is in the salt water for 4-5 hours it is transferred into a salty solution.
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Because the solute concentration in the salt water is higher then other solutions, in this case, a grape. the moisture is basically sucked out of the grape and the grape shrivels
Salt water is much denser than fresh water and therefore can provide a much greater buoyant force.
This solution is soda water containing carbon dioxide.
It will certainly not keep the water in the bucket from freezing and, if the temperature goes low enough, the bottled salt water will also freeze.
It gets wet.