Ramen noodle soups, you make the best
Water in the milk to make it stretch

from Lupe Fiasco – Hood Now (Outro) Lyrics on Rap Genius

Meaning

To save money in poor areas (hoods), the folks there would buy cheap, bulk foods like Ramen noodles that are easy to prepare and add water to milk in order to save as much of it as possible.

I.E. putting water and some milk to use to eat cereal with so that the milk lasts longer

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