This works best in a clean 16-ounce or larger pickle or jelly jar. It's a fun activity for kids and adults alike!
Pour all of the ingredients into the jar except the optional add-ins. Close the lid tightly and shake for five minutes. (Recruit help if your arms get tired!)
Put the jar into the freezer and let sit for two hours.
Add your mix-ins to the jar, if you'd like. Stir the mixture around if it has gotten too solid.
Freeze for another hour until desired consistency.
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