3-ounce boxes of red, orange, yellow, green, blue, and purple Jell-O mix
Start with purple and add one cup of boiling water to Jello-O powder in a bowl. Once the powder is dissolved, add ½ cup very cold water and ½ cup very cold vodka. Mix well. Carefully pour a small layer into plastic shot glasses, refrigerate until set. (This makes a LOT of shots if you want to save time, or have excess, pour the mixture into a glass baking dish and layer.) Let sit in the refrigerator until set, about 2 hours. Repeat with all colors, one at a time. You should end with red.
Please eat responsibly, ages 21+