Water-Making Spell

"The Water-Making Spell conjures clean, drinkable water from the end of the wand."

- Book of Spells

The Water-Making Spell, also known as the Aguamenti Spell (Aguamenti) is a charm that conjures a jet of clear, pure water and shoots it from the tip of the caster's wand. This spell, in addition to being a charm, can also be classified as conjuration, an advanced form of Transfiguration.

History
It's unknown who invented this spell and when. This spell was taught at N.E.W.T.-level in Charms class at Hogwarts School of Witchcraft and Wizardry, to sixth years. It's also possible that this charm is located in the The Standard Book of Spells series by Miranda Goshawk.

Effects
Depending on the caster's concentration and intentions, this charm can be anything from a simple jet of water to a wave. It is taught to sixth year students at Hogwarts School of Witchcraft and Wizardry in Charms class. The spell's incantation is Aguamenti.

Etymology
In both Spanish and Portuguese, agua/água means "water" and mente means "mind"; these derive from the Latin terms aqua ("water") and mens ("mind"), the latter's singular dative case rendered as menti ("to the mind" or "for the mind"). Given J. K. Rowling's love of puns, it would also seem plausible that there might have been a hybrid of água and "augment", in the sense of "increase", in her mind.

Behind the scenes

 * In, unlike in the book, Aguamenti appears as what looks like a shield of water instead of a jet. Furthermore, unlike in the book, the charm does not evaporate on contact with Fiendfyre.
 * It is possible that this is the same spell as the extinguishing spell, given it has been used for this purpose several times.

Notes and references
Aguamenti Aquatulio Sortilège d'Eau Агуаменти Aguamenti