Need urgent help for Nutrition Bar question.

[XCrunner]

Ok so here's a background, I'm obviously a runner but i also just enjoy working out and having a fit body. I am pretty muscular for a distance runner weighing about 160 or so and when I work out I focus on building lean muscle, but not to much, also toning it as much as possible through high repetition. Along with this I have a decent diet, I try to eat fruit for breakfast in the morning with something possibly for a few carbs or protein then after an afternoon workout I like eating plain tuna-fish, lunch meat, or basically anything high in protein and with some carbs. I always get in some fruit and vegetables, milk (most of the time with carnation breakfast drink), fat free yogurt, oatmeal, and drink tons of water. During school I find myself eating one larger also not very healthy meal and that's where i want change. Now I do want protein to build and maintain muscle but I also want very low fat content and decently low carbs. I Intend to find a nutrition bar for this and have two of those, a piece of fruit or vegetables, accompanied by fat free milk, and water to eat throughout the school day. Is this a good Idea? Any suggestions would be incredibly appreciated.

[Boss Man]

Low Fat, reasonable Carbs.

Skinless chicken, with Tomatos, Cucumbers and Peppers, or a couple of small Broccoli stalks, or a little bit of Pasta as examples.

You could have half the Chicken with Pasta, then compensate for some of the Protein and Carbs with something like Mushrooms as an example.