Humans are about 20% efficient. If your trip down to the cellar is 3 meters and say you weigh 90 kg with your water, just the trips up are going to add
3*90*10*5 = 13,55 joules of heat to your home every trip.
That does not sound too bad, but remember that the heat load is added to your home in a short time. Well... first to YOU, and then to the home
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Your comment in the OP that you would place the water away from direct sunlight suggests a better place to start for passive cooling: Shade those windows from the outside.