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This example will serve ~50 people. It will cost ~$45.

You need

Two bowls
a spoon for mixing
4lbs of mixed M and Ms
1lb of jet puffed miniature marshmallows
3 oz Kraft Jet-Puffed Mallow Bits Vanilla Marshmallows
2-3 oz of skittles
snack size zipplocs with two pictures (I used frozen and starwars)

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Mix this in the two bowls

Bowl 1-
2lbs of mixed M and Ms
2-3 oz of skittles
1/2 lb of jet puffed miniature marshmallows
1.5 oz of Kraft Jet-Puffed Mallow Bits Vanilla Marshmallows

Bowl 2-Ìý
2lbs of mixed M and Ms
1 lb of blue M and Ms
1/2 lb of jet puffed miniature marshmallows
1.5 oz of Kraft Jet-Puffed Mallow Bits Vanilla Marshmallows

You will also want to create a Google drive spreedsheet like this .

Click on the share button. Choose more. Set sharing to "On-Anyone with link" and acess to "can edit".