They sell raw milk at the pajarretes in Melaque. Early AM until maybe 11:00 or 12:00, not sure.
One is by Pemex, there at the Emiliano Zapata (el Ranchito) and Melaque crossroads. You can see the cows along with people, imbibers, if you head just a little ways, a block, towards La Huerta, just past the Pemex Station. Actually, you can get there from the Pemex Station.
The other is at the crossroads of the entrance to Melaque and Quastecomates, just after the Military base. Turn right as if you are going to Quastecomes and the entrance is immediately to your left by the huge crumbling highway sign. You'll see cows and calves.
You can also get a cup of milk with lightening (Cane Alcohol), instant coffee and/or chocolate, to your taste Cruz