I am a big proponent of making your own salad dressing. Most packages salad dressing just has too much crap in it that I can't pronounce, and a little dijon mustard, balsamic vinegar, good olive oil and salt and pepper will do more to elevate the simple salad than Hidden Valley Extra-Ranchy-Bacon-Bits-Parmesan-and-High-Fructose-Cream ever could.
That being said, there is one bottled dressing I am proud to use on a frequent basis in my kitchen: Annie's Naturals Goddess Dressing. Ingredients are as follows: Expeller-Pressed Canola Oil, Water, Tahini, Cider Vinegar, Soy Sauce (water, soybeans, wheat, salt), Lemon Juice, Sea Salt, Garlic, Toasted Sesame Seeds, Parsley, Chives,
It's not especially "low-fat" but won't break your caloric budget either. It ads a nice flavorful tang to salads, sliced avocado, even a nice turkey sandwich on whole grain bread with lettuce and tomato. I've used it as a marinade for chicken but find the flavor is really best appreciated as a dressing.
Other must-have products include:
Trader Joe's Marcona Almonds (the ones at Whole Food are too oily)
Fage Yogurt, of course (I prefer the 0%)
Canned Chickpease: For salads, curries, hummus: or, drain, roast with olive oil and salt for a tasty snack that will make your friends think you're really fancy (at least, mine did)
And then, of course, there's my sordid love affair with that most unholy and chemical of beverages...Diet Coke. Oh, sweet chemical goodness.