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Get a couple ice cube trays — even if you have an ice maker — to freeze cubes of other liquids, such as coffee, juice, nut milk, and coconut milk. That way, you get the thick frostiness you love in smoothies, without watering it down. We like these bendy silicone trays made by Arctic Chill. It's so much easier to get the cubes out with a flexible tray. These two BPA-free, non-stick, dishwasher-safe trays make 1-inch ice cubes. Price: $6.33.