Looks like you are ok with cooking. Man, I hardly ever bother to put cucumbers and tomatoes in my salad. If you have a routine though it should be pretty easy. Planning ahead saves time and energy. I generally like fruit and vegetables as they are. Just plain fresh. Too much work. Although I make an apple cobbler sometimes. I can give you a recipe if you want, super easy and very few ingredients.

Canned food cannot be that healthy I would imagine but microwavable is the worst probably. Added crap is really bad and besides it doesn't fill you up. I would rather fry an egg or something. That's why people can eat two bags of potato chips and be still hungry. I can eat couple eggs for breakfast and feel full even for lunch. So all natural food fills you up and makes you satisfied too besides having no junky ingredients added.