Regardless of what you get, one trick we learnt a long time ago was drain off the water. If you want ice to stay ice, then make sure the water gets out and leaves the ice dry. It takes a lot longer for the ice to melt if it is dry. If you use bottles of frozen water as slicka pads, then undo the caps and leave them upside down so the water gets out. Compare how long you have ice in that bottle with one where the cap is done up....
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