If making in a half gallon jug of milk, you can use approximately 6-8 drops mint extract, 4 teaspoons vanilla extract, and about 10-14 drops green food coloring. Close the cap very tightly and shake to combine.
Artificial food dye consumption is on the rise, especially among children. Consuming too much food dye containing contaminants could pose a health risk. However, with the exception of Red 3, there is currently no convincing evidence that artificial food dyes cause cancer.