To create the ice ring or block at least a day in advance (up to a few days), add distilled water to fill your chosen mold (e.g., a silicone Bundt pan) halfway up the sides. Freeze overnight. You can also incorporate decorations by pouring a few inches of distilled water into the mold and layering it with edible decorations of your choice (e.g., citrus slices, seasonal berries and fruit, fresh herbs, whole spices, edible flowers). Freeze for a few hours, then add more water to the mold until it reaches halfway up the sides and freeze overnight. If you encounter difficulty removing the ice from the mold, briefly dip it in hot water or run it under hot water to facilitate loosening.