Eat ruminant liver 1-2 times per week. Low-fat seafood 1-2 times per week. 1 egg per day. Milk, orange juice, coffee. Dates. Potatoes, sweet potatoes, or some other tuber or root. Well-cooked spinach, kale, or some other edible leafy green. Chocolate or cocoa powder preferably dutch processed as a mineral supplement.
Egg yolks are the daily vitamin supplement. Liver is the easy way to get most nutrients. Some occasional seafood helps prevent trace mineral deficiencies such as iodine and selenium. In a sense, milk can be seen as a processed version of greens that is much less time consuming to eat, but to get an equivalent amount of nutrition from greens typically involves eating pounds of leaves. Both orange juice and potatoes can cover vitamin C and vitamin B1 (thiamine). Actual strong coffee—as in espresso but not instant coffee or purified caffeine—has vitamins such as vitamin B2 (riboflavin) and vitamin B3 (niacin) with a bit of magnesium and strong coffee, cocoa powder, and/or dates are capable of adding some balance to the high calcium content of milk with additional magnesium. Dates are highly nutritious, but some other fruit might be cheaper and accessible where you live. Perhaps list what you have available? If you aren't excited about greens, it helps to at least drink the broth from boiling them in order to get magnesium + other minerals. Ideally, you should eat some whole leaves for the vitamin K1 content.
Leaves seem to be the way many animals get strong skeletons and big muscles, and milk is the substitute many humans have chosen (probably because humans can't do as much hind-gut fermentation as a gorilla). Chlorophyll is a very easily absorbed form of magnesium, and vitamin K is extremely androgenic. Milk largely works, but the mineral content differs from leaves. Variations such as chocolate milk or eating fruit with milk improve the mineral balance. Milk loses the large amount of vitamin K1 in leaves and replaces it with a small amount of the more active vitamin K2—which might be enough in traditional milk—but modern dairy industry processes mean milk products have less K2.
When money is tight, the majority of calories could come from milk and potatoes. Because of the ketoacids and water content, potatoes can be seen as a surprisingly good source of protein—not just carbs. Potatoes are reasonable for growing in a backyard garden. If you go that route, you'll last a long time before becoming extremely deficient in major nutrients. Occasional liver will fill in most of the gaps, but more than a couple times per week will probably result in iron overload. The more fresh, tropical fruits you can regularly eat the better most likely, but that may or may not be a cheap or practical lifestyle. If meat in general is cheap, some muscle meat is okay at preventing certain deficiencies, but gelatinous cuts—such as oxtail and tendons—and bone broths have the gelatin/glycine that makes frequent meat eating much, much healthier. Bone broths are time consuming though, and the bones are also where animals will accumulate things like lead and fluoride (when they live in bad environments). Being a frequent lifter probably makes the amino acid balance of muscle meat safer, but everyone seems to do better with a higher glycine and taurine ratio.