Aqua Cura

 is a fake version of Aqua Pura produced by the ghoul Griffon by switching Aqua Pura with irradiated water to sell to the ghouls in Underworld. He would then sell the real Aqua Pura to people the brotherhood wouldn't give it to, such as the Raiders and Brotherhood Outcasts, to increase his profits.

Griffon also tries to increase his profits on the water by telling the ghouls it has effects that will benefit them (which it does because it heals them with the radiation, but it also furthers their "ghoulification".)

Location

 * Several are found in boxes on/next[right of the table] to the table next to Griffon,(Table also includes a cash register with 21 caps)
 * Can be bought from Griffon(which costs 10 caps)
 * 30 can be found in Griffon's bottling operation (which is in the Museum Authority Building)
 * If a certain speech challenge is used to complete the quest, The Amazing Aqua Cura, Griffon will then sell regular Aqua Pura, although he will continue to call it Aqua Cura which he claims is to give hope to the ghouls that purchase the water (though it is probably for marketing reasons).

Trivia

 * The name aqua cura is probably a nod to a t-virus based medicine with the same name from the Resident Evil game series.