When my kids were little and they were allowed to have halloween parties at school. I always made the punch.
Take a rubber glove and (first wash/rinse it out first if it is one that has powder in it.

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and fill it with some sort of red punch. Tie a knot in it and put it in the freezer and freeze it solid. Then put you frozen hand in the punch bowl. (there is your ice!) It is always better if you can get access to dry ice and put it in the punch bowl too!
All the kids loved it!