I found this on a walmart recipe card:
Tex-Mex Mac and Cheese
1 lb ground beef
1 cup chopped onion
1 (18.5-oz) can ready-to-serve creamy tomato soup
1 (1.25-oz) pkg fajita seasoning mix
4 cups cooked shell macaroni
2 cups shredded mexican cheese blend
1 cup halved cherry tomatoes
1 (2.25-oz) can sliced black olives, drained

Brown beef. Add onion and cook 3 min. Stir in soup and fajita mix.
Mix in macaroni, 1 1/2 cups of the cheese, tomatoes and olives.
Spoon into 2-quart baking dish. Top with remaining cheese.
Bake 30 min.

My question is that I can't find the ready-to-serve creamy tomato soup
so can I use condensed tomato soup mix with milk instead?
Also why use fajita mix...why not taco mix?