Most foods you eat will be pre made or have a convenience factor so they will be more expensive than buying raw meats. And eggs etc.
A Rotisserie chicken a day is great. You can break that bird up into 2-3 meals worth of protein. Carton egg whites and/or beaters. Milk, Instant rice , oats peanut butter, whey. Fruit, avocado, canned veggies, tuna, any canned meat.
And see what kind of food the hotels serve at breakfast. I've been on business trips where the hotel had Greek yogurt cups, rice, oats, and hard boiled eggs. I would grab a bout a dozen eggs and some rice and yogurt and keep them in my fridge
I'd recommend bringing a scale even if you do not normally use one everyday. Just because eyeballing food everyday for four weeks can derail your progress.
And I would personally eat lighter on your own because I am sure there will be business lunches and dinners you will be attending. Obviously you try to eat clean at these events but that isn't always an option
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