Spectra from MIRI-MRS at 13.5-17.5 μm of the Class I source B1-a-NS showing only cold water (van Gelder et al. 2024a) and of the Class II disk DF Tau showing it being rich in warm H₂O and other molecules (Grant et al. 2024). The colored spectra show LTE slab models of individual molecules contributing to the observed spectra; they are meant to illustrate the positions of the lines, not as a fit to the data. The temperatures used on the H₂O slab models are 190 K (cold) and 490 K (warm).