Company Names, addresses, dates¹:
  Baldwin and Leitch, 220 D St South (1866)
  Andrew Baldwin, D North Cor 3d West (1867)
  Andrew Baldwin, 332 3d SW (1872)

Notes:
The 1866 city directory lists Baldwin & Leitch in the residential section as Andrew Baldwin and John Leitch.
Andrew Baldwin is listed in the 1870 census as a grocer born 1835 in Ireland. I think that's the right Andrew Baldwin because his home address is 332 3d SW, the same address as the Andrew Baldwin who was listed as a bottler. Maybe he was both a grocer and a bottler?
John Leitch is listed in the 1860 census as a bookmaker born 1833 in MD. Not sure if that is the right John Leitch or not, but the age seems about right.


Bottles:

(enlarge)

This is a 7" aqua squat soda bottle, marked: front: BALDWIN & LEITCH / WASHINGTON, D.C. back: B & L