h3o
AQUEOUS CATION H₃O⁺, THE TYPE OF OXONIUM ION PRODUCED BY PROTONATION OF WATER
Hydroxonium; Oxidanium; Hydronium ions; H3o; Hydronium ion; Hydroxonium ion; H3O+; H3O+ ion; H3O; Eigen cation; Zundel cation; Zundel ion; Hydromium; H5O2
Describes tap water that is just barely drinkable, due to cloudiness or poor taste.
Bob, if you're thirsty, help yourself to a bottle of water from the fridge. The stuff that comes out of the tap is more like h3o.