Two basic water words, with which we can start to build other water words:
žem potable water. Fresh water, sweet water, rain water, water in (some) lakes and streams. Water from (some) wells, a tap, or a bottle.
ˈθospa ocean water and other non-potable water. Salt, or brackish, or polluted water. Includes urban runoff. If the speakers of this language have a Salton Sea or Great Salt Lake, it includes that too.