An easy way to have ice cubes is to go to a film developing business....yes they still do that sort of thing. Every roll of 35mm comes in a plastic container that is thrown away when the film is developed. Gather as many as you want and use them to make ice cubes. Do not fill all the way to the top with water because water expands when it freezes. Now you can freeze them and only take out as many as you need for your use.
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