H₂O 1₁₀ − 1₀₁ spectra toward low-mass embedded protostars with and without disk-like structures. RNO91, TMC1A and L1489 are Class I sources with disks; L1527 is a Class 0/I source with an embedded disk whereas B335 is a Class 0 source with no clear evidence for a disk down to 20 au. DG Tau is a young Class II source with disk and jet. These are WBS spectra binned to 0.3 km s⁻¹ while B335 is binned to 0.6 km s⁻¹ velocity resolution. The horizontal green line indicates the baseline. For TMC1A, the blue line indicates the ALMA ¹³CO spectrum of the rotating disk to indicate its width (Harsono et al. 2018).