I pack my lunch to work everyday. I eat low carb, but here is a what I typically take:
1/2 cup of chicken salad made from white meat diced up, some mayo, celery, and onion - on a bed of romaine lettuce with some bottled water.
Chef salad - strips of ham, turkey, and cheese with a sliced up hard boiled egg on a bed or romaine lettuce. I bring 2 TBS of ranch dressing in it's own small container and put it on at the last minute - plus bottled water.
Steak salad - strips of steak sliced up on a bed of salad greens (either romaine or baby spinach). Separate container of ranch or blue cheese dressing and of course... some water!
Chicken Taco Salad - strips of grilled chicken, 1/4 cup of grated sharp cheddar cheese, 1/4 cup of diced fresh garden tomatoes, 1/2 of a small ripe avocado sliced on a bed of romaine lettuce. I bring 1/4 cup of sour cream in a separate container and add it at the last minute. With... YOU GUESSED IT... bottled water!
If I am in a real hurry... I grab left overs from the dinner the night before and just have a repeat... usually a roasted chicken thigh and some steamed brocolli with some butter... just microwave both for a minute to warm up... and have it with... you guessed it... some water!
I eat good.