No, drop the energy drink completely. What are you thinking, that's your problem right there. It's expensive, and probably accounts for half your food spending. It's also fucking terrible health wise especially if you aren't eating much of anything else. There is no such thing as "supplementing" with an energy drink.

Things that are cheap and good imo: rice, lentils, bulk nuts, canned beans, tuna tin cans and veggies in general. Porridge sucks but it's easy to make and cheap. If you want to avoid energy use while cooking, look into cooking in a thermos, stuff like couscous, porridge or noodle soups.

Hunt specials and change where you buy thing if needed. If you don't like veggies, boil and blend. Ration of like 1/3 potato, 2/3 veggie, stock, plus some onion and garlic.

Get the oil, it's basically where people get half their calories.

What's your budget anyways (food total, include the money spent on fast food and energy drinks).

Wouldn’t a multivitamin be cheaper than an energy drink?

If dental care is free, go see a dentist asap and tell them about your issues.

If medical care is free or cheap I highly recommend you see a doctor as well, to tell them about your issues around food and eating, both emotional and physical.

They can prescribe high calorie, high nutrition drinks to supplement and support your diet. And a lactose neutraliser if you're intolerant and the drinks contain milk. And possibly an appetite stimulator to make eating seem more appetising.

A medium potato has 30% of daily vitamin c but you need to eat the skin. So scrub potatoees and leave skin on when cooking. It will also be better to bake or fry. Even if making mashed potatoes, you can bake them and then mash with skins on. They’re better this way imo.

I’m glad you’re looking into vitamin c deficiency. I wasn’t listing my ingredients as suggestions, I was explaining what worked for me and hope you find some analogous recipe for your own meals. I hope you land on something affordable, maintainable, healthy and delicious!