This is a Water-making type spell! it has been used by our "magical" fire fighters to put out fire's but there is no recorded memory or anything when this spell was used! So lets just jump straight into the etymology of things.

ETYMOLOGY: in both spanish and portuguese, "Agua" means "water" and "Mente" (which is italian) mean's mind, the latter's singular dative case rendered as "Menti" ("to the mind" or "For the mind") 

Now onto the pronounciation of this spell it is most important that you get it right! for even all of your spells, so pay attention! LOOK AT YOUR BOOK! anyway, say it as "AH-gwah-MEN-tee". Last time i said it wrong and water splashed my face and ruined my clothes! 

Never mind that and practice your wand movements by this photo below.

Goodluck young wizard!