You can make snow cone ice without a blender using a freezer bag and a rolling pin.
Here's the method:
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Prepare a Freezer Bag: Fill a freezer-safe silicone bag or a sturdy plastic zip-top bag about halfway with water.
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Freeze the Water: Seal the bag tightly and place it in the freezer until the water is completely frozen.
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Break the Ice: Once the water has turned into ice, remove the bag from the freezer and place it on a counter or another hard, stable surface.
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Crush the Ice: Use a rolling pin to break up the ice. Roll the rolling pin back and forth over the bag until you achieve your desired consistency of crushed ice for snow cones. Be careful not to puncture the bag.