The title compound, C11H9N3O2, exists in the E conformation with respect to the azomethane C=N bond, and has the keto form. There are two independent mol­ecules in the asymmetric unit and each of these features a slight slanting of the pyridine and furan rings, which form a dihedral angle of 14.96 (10)° in one of the mol­ecules and 5.53 (10)° in the other. The crystal structure is stabilized by N—H⋯O and N—H⋯N hydrogen bonds, weak C—H⋯O and C—H⋯N hydrogen bonds and C—H⋯π inter­actions and π–π inter­actions [shortest centroid–centroid distance = 3.7864 (15) Å].

The title compound, C15H13BrN2O3·H2O, exists in an E conformation with respect to the azo­methane C=N double bond. The benzene and phenyl rings form dihedral angles of 0.46 (2) and 4.90 (3)°, respectively with the central C(=O)N2C unit. An intra­molecular O—H⋯N hydrogen bond occurs. In the crystal, some hydrazide mol­ecules are replaced by mol­ecules of the 6-bromo isomer. The Br atom from this admixture was refined to give a partial occupancy of 0.0443 (19). A supra­molecular network is built in the lattice by means of inter­molecular N—H⋯O and two O—H⋯O inter­actions together with non-classical C—H⋯O inter­actions involving the lattice water mol­ecule stacking the mol­ecules along the b-axis direction.