I’m not exactly sure of your question. Anything other than food, like a bar or protein shake are considered meal replacements. Like EZ said, learn to meal prep. I work M-F and I meal prep on Sunday for my entire work week. But if you want a replacement shake, create your own like I do. I use almond milk, protein powder, whole blueberries and bananas, sometimes add PB or oats. You can’t take these with you, as you need to drink it immediately after making it. But if you’re looking for a product like a bar or shake that you can carry with you. You’ll need to do research on the bar or shake. Look at the ingredients and nutrition facts. Keep in mind most bars are like candy bars, and shakes don’t usually taste good.