First triple the amount of milk to find the amount of chicken stock: 2 quarts * 3 = <<2*3=6>>6 quarts
Then add all three quantities to find the total volume of the soup: 6 quarts + 2 quarts + 1 quart = <<6+2+1=9>>9 quarts
Finally, divide the number of quarts by the number of quarts per bag to find the number of bags needed: 9 quarts / 3 quarts/bag = <<9/3=3>>3 bags
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