This is for chocolate. Link to yellow is at the top of this post, white you just leave out the cocoa powder. Mix together dry ingredients above and store in separate baggies with a note on the front with what you need to prepare it into batter: 1 1/4 c water + 1/2 c vegetable oil + 3 eggs + 1 tsp vanilla extract.
When preparing batter add your mix with wet ingredients. Use a mixer on low to combine well so it is smooth.
Preheat oven to 350 degrees F. If baking two round cake pans it will take 20-25 minutes, cupcakes take 15-18 minutes. I'd lightly spray pans with non stick or use muffin liners.