Am an MS0 beginning next year, but I've got good habits that some of you might benefit from, in no particular order:
0.5) Invest in quality tupperware of all sizes.
1) If bunch of restaurants are around, buy a few lunches (cheaper) and freeze them for a while. I get great restaurant food for $6 around me.
2) Buy really good fresh soups (particularly asian, thai, vietnamese) and load them up with veggies. Again buy a couple of extra and freeze them. Even a simple wonton soup with 3 carrots, steamed brocolli, red bell peppers and some tofu added can be very filling and nutritious. The broth alone if a great base for fresh, healthy ingredients added.
3) Saucy dishes - everything from indian/thai/chinese to pasta. Freeze the excess sauce, top a dollop or two over a piece of grilled chicken, a tasty, restaurant quality meal in 10 minutes. Accompany with veggies.
4) Lightly steam veggies for the next 3 or 4 days, so they are ready to go.
4.5) Half a tomatoe with every meal at home. Quick, lo cal and healthy boost to whatever.
4.75) A few slices of avocado a few times a week. I actually put 5 slices of tomato and avocado on a fast food burger to avoid the guilt.
5) Instead of peanut butter, use natural almond butter - higher in unsaturated fats. Watch the transfat with pb - you can find "all natural" pb. Oil separation is a good sign.
6) Breakfast is my "really healthy meal", b/c i'm always on the go. Strictly regimented - OJ, apple, banana, a few nuts, oatmeal, skim milk, yogurt and shredded wheat. Some combination.
7) Smart Balance buttery spread...the best. Extra virgin olive oil only. V8 Low sodium rocks, alot of potassium that is missing from most of our diets (they use KCl to replicate the salty taste).