tomato based soups

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i know how to cook, but im in a situation where i have to get cheap ass food for a little while which is unusual for me, so im looking at stuff like ministrone soup.

some recipies (which i'm looking at for ideas) say to use pasta sauce with stock. should i do that? or should i be using cheap pasata, or fresh tomatoes? buying tomatoes fresh at the moment is a bit expensive so i'd prefer not to, but i'd also prefer whatever i make to not turn out like shit.