Bumblebee Snack Packs
https://www.bumblebee.com/products/
Ritz Bits - I like the peanut butter sandwiches, but you can also get cheese
Del Monte Veggieful Veggie Bowls - I like the Quinoa with Roasted Red Pepper
https://www.delmonte.com/products/snacks/veggieful
When I was pregnant/nursing, I’d often snack on peanuts, saltines, dried apricots, and cheese. You can adapt this to your preferences.
If you get an insulated lunch box and an ice pack, you should be able to have whatever you want cold for a snack - yogurt, sandwiches, single serve guacamole and chips, hummous, etc.
If you have a thermos for hot water or a coffee maker, etc., you could also do instant ramen, cup of soup, etc.