Scoop drops of each colored batter into the Bundt pan until all batter is used up.Mix in a few drops of color into one of each of the remaining bowls.Mix a few drops of blue gel food coloring into one of the bowls.In a large bowl, mix together the vanilla cake mix, eggs, water, and oil.Purple, Blue, Orange, Green, Yellow and Red Gel food coloring.How to make Instant Pot Fruit Loops rainbow Bundt cake Make it for your kid’s next birthday party, to celebrate Pride month or for a tie-dye party. This version also has a special touch for cereal lovers: it’s topped with crushed Fruit Loops! It’s not only crunchy but makes this rainbow Bundt cake totally unique and fun. Just use a box cake mix to save time and add food coloring with the instructions below and you will have your own gorgeous rainbow cake. Not only is it stunning but it’s easier to make than you think. If you want to impress your family, then this colorful Instant Pot rainbow Bundt cake is the way to go.