What's the noun for watersport? Here's the word you're looking for.
water
(uncountable) A substance (of molecular formula Hâ‚‚O) found at room temperature and pressure as a clear liquid; it is present naturally as rain, and found in rivers, lakes and seas; its solid form is ice and its gaseous form is steam.
(uncountable, in particular) The liquid form of this substance: liquid Hâ‚‚O.
“The waterskin slipped through Darteil's fingers, wetting his shirt.”
“She shouldered a full waterskin, and a bundle of wrapped dried meat and flour, and stepped into the footsteps of the men who had violated her and murdered her lover.”
“He retied his waterskin and stuck it back into the folds of his cloak.”