How do I meal prep for at least a week?

Fried hamburger patties are good for a week, and wake up in less than a minute in a microwave. Pulled pork and meatloaf will also last the duration. Chicken is a little more temperamental, and for weekend delivery, I'd label it eat on or before Thursday. I make both beef stew and chili that will go for 10 days. What you are doing is great. Hope you get Karma points.

Fresh ingredients for salads are the most difficult to keep fresh for a week. You don't need to refrigerate many of the ingredients like onions, some greens last a few days without refrigeration but most won't last a whole week but the ones that do are the ones that have fiber. Greens are the healthiest. Iceberg lettuce has no food value whatsoever. Cooked red meats will last a week in the fridge but they should only be eaten sparingly as they are not the healthiest of foods. poultry when cooked will last up to a week. Pasta with a sauce will also last up to a week but not without a sauce. Without a sauce pasta will last a few days. Veggies will last a week in the fridge after they are cooked but much longer before they are cooked. Uncooked veggies do well at room temperature unless you like to keep the house very warm. So find a cool place to keep them. The ideal temp for the house is 68 degrees.

Look online and get some recipes for the ingredients you have on hand, then you will know what to do. I would not leave cooked meat more than 3-4 days, and cooked pasta is good for about 48-72 hrs. Don't cook huge amounts of things, unless your friend can freeze some of the food to be eaten in the future.

Yes, pasta and anything else will get dry or gross after a week. If you really need it for more than a week your in the prison slop category. If only you had an ability to talk to a prison slop cook...?

Pick your meat, any meat (or just skip the meat). A basic, classic start is carrots, onions, and celery. You blast that in a big deep dutch oven until it starts to stop smelling great. Then you throw in a breaded meat or just a few teaspoons of flour. Measurements don't matter much. You'll learn with time to eyeball it. Then dump in enough broth or bullion to cover what's in the pot and boil for a bit. Then put in your soft vegetables like peas or corn. Cover and let it simmer for about 3 hours.

When it cools, put it in serving size tubs and freeze them. You keep taking out a tub about 3 days before you need it to let it thaw and keep that cycle going.

Foods are "good" for 1 week in the fridge. But if there is a possibility that your friend may not eat everything right away, for what ever reason having items for the freezer is the ideal situation.

Foods that work well to be reheated are casseroles like a tater tot casserole, chicken and rice etc.

Pot pies

Lasagna

Roasted chicken or turkey with gravy rice and a veg

Chili, Stews and many other but not all soups

Other ideas would be a wrap or sandwich or 2 and also if you know what kind of salad your friend eats then a small portion of salad or two would be nice as well.

Does he have a freezer? That makes all the difference really. If he can freeze things casserole, soups. Stews, pizzas, taco meats, enchiladas, pasta dishes, rice dishes, etc. Can all be easily frozen and put in the oven.

Frozen is your best option. 

Lasagna or almost any pasta dish can be frozen. (I would not freeze spaghetti though. Freeze sauce and give them dry pasta)

Meatloaf freezes well. 

Chili

Soup

Stuffed Peppers

Almost any casserole. 

I do not keep any prepared/leftover food in my refrigerator for more than 4 days.  If I am not going to have it within 4 days I will freeze what is there in portion size containers. 

Cooked meals should be eaten within 4-5 days at the MOST. After that, whatever is left should be thrown out.

Given them one dish that has 4 meals in it, and then another that is FROZEN and has 3 meals' worth in it.

Do not precook 7 days' worth of food and give it to the without freezing part of it.

A week is a long time for food to stay fresh and safe. Why not make foods you can freeze?