For Birchbox's 31-day challenge, I prompted readers to skip the bottle and make their own salad dressing. Pouring on packaged dressings can derail your good intentions for a crunch-fest. Instead of boosting the nutrient level of your greens, you are likely adding sodium, sugar, artificial flavors, and preservatives. Here are three simple dressings that you can make at home to elevate your crunch-munch game.