Joie Reusable Lemon Ice Cubes with Cup. These reusable ice cubes are designed to chill beverages without diluting them. They are shaped like lemon slices and come in a set of 24, along with a reusable cup. The ice cubes are made of food-safe, BPA-free plastic and are filled with distilled or purified water. To use, simply freeze the cubes and add them to your drink. After use, wash and refreeze. They are also dishwasher safe.