髒水是廢土上最常見的飲料，It is drawn from the tainted lakes, rivers, and puddles. 不像純水，喝這個會增加輻射，which can be cured for a fee by a doctor or through RadAway.
Aqua Cura is regular irradiated water disguised in an Aqua Cura bottle that Griffon sells in Underworld to cure a plethora of illnesses that ghouls often suffer from. Griffon also takes the real Aqua Pura and sells it to other wastelanders at an inflated price.
Purified water (1)
Irradiated water is a variant of dirty water in Fallout: New Vegas. 回復效果和普通版差不多，不過輻射會增加3倍。A limited amount of bottles can be found and they are mostly located in highly irradiated areas.
In Fallout 4, drinking such water will restore some HP as well as increase the irradiation level of the player character.
Behind the scenes
Each bottle of purified water appears to feature the text "'H²O" hand written on the label on the side of the bottle. This format is incorrect (at least according to IUPAC nomenclature) as in chemical formula numbers are written in subscript, not superscript. If read literally, the chemical formula H²O would mean there is one hydrogen and one oxygen isotope that contains two neutrons (instead of the standard eight). This would leave the oxygen extremely unstable and radioactive with a half life that would be so small that it would not be measurable.