Gather your supplies: white cake mix, food coloring, eggs, vegetable oil, and water.
Set the oven to the set temperature on the cake mix box.
Get the eggs, cake mix, water, and oil. Next, make the cake batter (recipies vary when using different brands).
Once you have your cake batter made, separate the batter evenly into bowls (number depending on how many colors you want). Mix in the food coloring.
Move the colored batters into ziplock bags, and squeeze out as much air as you can. Then, cut a tiny hole on one of the bottom corners of the bags.
Set aside the bags of cupcake batter, and put the cupcake liners into the pan.
Pick one bag and squeeze the batter into the cupcake liners in a zig-zag motion. Make sure you don't cover the whole bottom of the cupcake. repeat this process untill all the batter is gone.
Once you use up all of he batter, then place the pan into the oven and bake for however long the cake box says.
The cupcakes should look like this when they come out of the oven.
Lastly, enjoy your cupcakes and leave your friends impressed with your cupcake skills.
(optional) Buy some frosting from the store and add it to the cupcakes after they cool off. Or, you could make your own frosting.