Multiple computational and theoretical studies support the existence of distinct low-density and high-density liquid phases of water under supercooled and extreme conditions, settling the claim that water exhibits more than two distinct fluid phases.
The retrieved literature consistently discusses the hypothesis and simulation-based evidence for a liquid-liquid phase transition in water, separating low-density and high-density liquid phases, in addition to standard gas-liquid states. The evidence strongly supports the claim, yielding a verdict of SUPPORTED.