hmmm tomorrow I'm taking...
homemade tomato soup, leftovers of a loaf of bread (for dipping and for toast for morning tea), oats for porridge, a banana, a pear, 2 chocolate crackles.

i work generally Monday to Thursday and going out of my office is a PITA so generally I take leftovers. I have a freezer full and just pull one out or have them from the night before.
On Sundays I try and add to the freezer with a casserole or pot of soup or bolognese, chilli con carne etc.
I'm not a huge fan of salads, so in my office I have a can of baked beans/spagetti in case of emergencies and some cheese in the fridge. I also have tinned fruit in the fridge for my porridge or a snack.