I would suggest going to Frisco's just north of DC in Crofton. Pint night is wed and they have about 80 ish beers on tap and a phone app to see what they have.
DC has a ton of place with a HUGE selection. Jack Rose for whiskey, bourbon, and scotch 200+, H street has an irish pub with good selection, U street has a few. There is the DC distillery i believe called C&O.
The App Beermenus is amazing in DC if you're trying to find a good beer on tap. Also try Mellowmushroom Holy Shitaki Pie. You'll thank me.