This article explores how water performs on the contemporary stage. Drawing on theorists such as Rosi Braidotti, Karen Barad, and Joanna Zylinska, we investigate water in its various dramaturgical functions as matter, medium, and metaphor to sketch performance alternatives that highlight nonhuman forms of agency. Focusing on the work of sound artist and geographer AM Kanngieser and their use of water to listen to the Anthropocene as well as on the Filter Theatre production of David Farr’s play Water (2007/2013), we want to highlight how diffraction and resonance alternately provide ways of rethinking traditional configurations of making meaning. The sonic dimension of water, in particular, turns into a productive site for manifesting the heightened relationality of the Anthropocene world. The article thus argues that the material dramaturgies of water show how the crucial interactions between science, philosophy, and performance manage to sketch new posthuman knowledge formations.