Having grown up dirt poor it was one of the cheapest and filling meals one can have though we never used V8 but used Tomato juice.
Key is to not over cook the elbow macaroni before you drain the water and add the Tomato juice.
If you like that you might like egg noodles and chicken broth. it's chicken noodle soup without the chicken and dumplings. Frozen egg noodles are my favorite but take too long so I go with regular wide egg noodles.
Let me list the meals of the poor as I grew up an expert.
Mac and mater juice
egg noodles and chicken broth
mac/cheese with tuna and cream of mushroom soup (tuna caserole)
Hamburger with diced potatoes and shaved carrots mixed in.
Ramen Noodles of course
when we felt rich we might throw in a cube steak.. lol