Miriams Kitchen serves approximately 300 meals to the homeless every day and is located very close to GW. Hours are:
Breakfast: 6:30 - 8:00 AM
Dinner: 4:45 - 5:45 PM
2401 Virginia Avenue NW
Washington, DC 20037
They also provide case management to help with job search, housing assistance, etc. More information can be found here.