I'm not sure exactly how much you would need. If you are not living in the house you buy you would be buying it as an investment property and loans will require more. I think 25% down for an investment property. If you buy a multi-family residence and live in it you can get an FHA loan (3.5% down). Like I was saying as a college student you can always buy a house and live in it and charge your friends rent to occupy the other bedrooms. But keep in mind the money down is not he only capital you will need. You are responsible for replacing things that go wrong. If the A/C breaks down, the furnace, plumbing issues, electrical issues. It depends how handy you are too. For this scenario it would be beneficial if you were skilled at multiple trades. Electrical work, plumbing, know HVAC systems in and out. I do all of my own maintenance and save a ton because I know how to do all of that stuff.
My best advice, get a job. save,save and save. Meanwhile make connections, and make plans on what you will do once you get enough to buy and cover expenses.