It will really depend on what you prefer, and its usually trial and error. I have oatmeal and a protien shake for breakfast. Some just want coffee. Others have a huge breakfast with sausage, eggs, toast, juice, etc.. Some don't eat until after they get to work.

I bring my own lunch which is usually brocolli and a hamburger. I also bring an apple as a snack. I will sometimes bring PB&J as well. I have some sterlite locking containers that I got from walmart that work pretty well.