Work Lunch Ideas? - No Way To Heat/Re-Heat

Took on a seasonal outdoor job to make some extra $$. 10+ hour days and physical, so no way I am fasting. Won’t be able to heat/re-heat meals but picked up a cooler bag to keep meat cold and some plastic containers.Thinking just ground beef and like a brick of cheese and good quality pepperoni/salami or what have you in case the beef doesn’t suffice.Anyway, looking to hear what others do to maybe get some ideas. I’ve been self employed the whole time I’ve been eating this way (6 months!) and am used to just cooking at home for all my meals along with the occasional McD’s patties in a pinch.Thanks.

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