but I only know 2 types of water in a stable state
H2O and ²H2O
http://fr.wikipedia.org/wiki/Eau_lourde
Heavy water is deuterium oxide (formula: D2O or ²H2O). Chemically, it is identical to normal water (H2O), but the hydrogen atoms of which it is composed are heavy isotopes, deuterium, whose nucleus contains a neutron in addition to the proton present in each hydrogen atom .
There is also semi-heavy water (HDO or H²HO), moreover in natural proportion much larger than heavy water.
Gilbert Newton Lewis in 1933 isolated the first sample of pure heavy water.
Ah well no, there is also H2O2, but it is no longer "water", but hydrogen peroxide http://en.wikipedia.org/wiki/Hydrogen_peroxide
Hydrogen peroxide (H2O2) is a very pale blue liquid, slightly more viscous than water, that appears colorless in dilute solution. It is a weak acid, has strong oxidizing properties, and is a powerful bleaching agent. It is used as a disinfectant, antiseptic, oxidizer, and in rocketry as a propellant. [2] The oxidizing capacity of hydrogen peroxide is so strong that it is considered a highly reactive oxygen species.
Hydrogen peroxide is naturally produced in organisms as a byproduct of oxygen metabolism. Nearly all living things (specifically, all obligate and optional aerobes) possess enzymes known as peroxidases, which harmlessly and catalytically decompose low concentrations of hydrogen peroxide to water and oxygen.