The condensation reaction of water cluster anions, (H2O)(n)(-) + H2O -> (H2O)(n+1)(-), offers a prime opportunity to explore the growth process of the hydrogen-bond network involving molecular uptake and network rearrangement. Here, by exploiting an Ar-mediated approach, we investigate the association reaction of water hexamer anions, (H2O)(6)(-), with ROH (R = CH3, C2H5, 2-C3H7) by mass spectrometry combined with photoelectron spectroscopy. Quantitative analysis of the product mass spectra reveals that incorporation of ROH (R = CH3, C2H5) into (H2O)(6)(-) occurs with a cross section of the same size as in the (H2O)(6)(-) + D2O condensation, but with a slightly smaller cross section for R = 2-C3H7. Coexistence of two types of isomers, high electron-binding (type I) and low electron-binding (type II) forms, is observed in all the product ROH center dot(H2O)(6)(-) species by photoelectron spectroscopic measurement. These findings, in conjunction with ab initio study of MeOH center dot(H2O)(6)(-) structures, lead us to propose a molecular uptake mechanism at play in the incorporation of ROH into the (H2O)(6)(-) network. This also provides complementary information on the homogeneous condensation process of pure water cluster anions.