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Peel the bananas and blend with the 1/2 cup of sugar and 3 cups of water. Process until smooth.
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In a separate large pan or bowl, add the pineapple juice and cans of orange juice concentrate, along with the other two cups of water.
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Pour in the banana mixture and blend well.
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Transfer the mixture into three separate airtight containers or gallon-sized Ziploc bags.
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Freeze overnight.
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When ready to serve, remove the frozen slush from the freezer and let thaw until slushy but not liquid.
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Place in a punch bowl and pour two liters of soda over the top. Break up any large pieces of slush.
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Add berries for garnish if desired.
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Makes about 30 servings if you use all three bags of slush.