Edible Blood for Halloween Party Foods: 1 cup light corn syrup, Red food coloring, Blue food coloring, 1/4 cup water Directions: Put red food coloring in corn syrup and stir until resembles blood. Amount varies. Add a drop of blue at a time to give the blood a bit of an authentic tint. Stir in water to thin the mixture out. Add more water if you prefer it runny.