Fill empty yogurt containers 3/4 full of water and freeze. This makes very large ice cubes that will keep a drink cold for hours. They can also be used in vacuum bottles to keep drinks cold all day. To remove the ice, simply hold the container under running water for a few seconds. The ice will slide right out and the container can be refilled to use again.
Randal
Related: 
Uses for Yogurt Containers
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