A simple check list is easiest.
For example: you need a protein, veggie/fruit, and water with every meal + carbs post workout
Make a chart with those column title, and meal # down the first colume.
You need 6 meals, each of which should fit the rules above. Leave the other columns empty, and simply add a check mark or an x to each column/per meal. Aim for 90% complience and you'll see results.
So without worrying about calories, fats or otehr carbs you can track a simple diet.