How can I eat cheaply and well?

i'm in college and live in an apartment with friends. my parents used to send me money for food so I could shop at whole foods and not worry but now they've stopped paying for my groceries so I have to use money from my part time job.

i only have $20 a week for groceries. I know I can get a bunch of ramen but I want to be healthy and eat well. where and how can I get 3 meals a day, 7 days a week for $20? I'm a vegetarian if that helps.
How can I eat cheaply and well?
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