The largest grocery store is Streets and there are several smaller ones. If you're looking for like a Ralphs-like or Vons-like supermarket experience, you will not find that in any of the neighborhoods near either of those universities.

I am using close loosely now, but the closest to Homewood is probably Abell, Waverly, and probably Hampden. The closest to University of Maryland is probably Federal Hill. Bayview has a Streets Market nearby. And Hopkins Hospital's nearest grocery is probably Safeway or Whole Foods. And to be clear I am using grocery store as to mean medium or small vendors that sell mostly food and a good quantity of fresh food but has some general household items ot and do not specialize in cuisine of a certain ethnic group.

If the grocery stores are the main draw, maybe map them on Google, but there just aren't a whole lotta lotta walkable grocery store situations near universities in Baltimore.