Arquatia

After you wake, you notice your chest of ice water is almost empty, it'll be gone after you have your morning wash. You'll need to tisit the local river or a temple to Arquatia to get and bless more.

When the world was burning from the uncontrollable fire of Faera, one shard of the shattered Void dearly wished to help. It took the shape of a new goddess, who immediately saught to soothe and calm her fiery sister.
She took the form of a water goddess, and hugged Faera as she brought water to the world, quenching most of the fire and cooling the world so the lava became land.
The two sisters revere Lutecia, but are especially close to each other, the older Faera being eternally grateful for her healing and constantly soothing presence. It's to the extent that the domains of each goddess that their mortal worshipers and adherents spend their afterlife in are linked, as a tropical beach resort and lagoon where the souls may intermingle.
Some of Faera's fires are still deep on the ocean floor, and come out as volcanic eruptions. This births new, fertile islands when cooled by Arquatia's waters, and are seen as blessed lands and gifts of both goddesses.
As befitting her desire to heal her sister and the world, Arquatia is the inventor of healing magic, and the naiads she creates from her essence and their mermaid descendants from mortal lovers are tasked to follow ships and rescue people and animals from drowning, and work to tirelessly stop Lilith's attempts to destroy with storms and whirlpools and hurricanes, serving as warnings and disaster relief.
When her younger sister Gaelle made plant life they both worked on underwater plant and animal life first, as the land hadn't fully cooled down yet, and Arquatia's healing waters made making life easier. Their first and many creations were new and primitive, and only after much time did they begin to make larger and intelligent life.
Arquatia makes sure to heal and feed life on land by blessing it with rain, and making and maintaining lakes and rivers and ponds. Together the three goddesses of fire, water, and Earth make the life trio.
Arquatia has made a magical sheath to wear that works as a swimming tail that she can wear and remove at will.
But unlike the naiads she makes for the souls of the lonely departed, Arquatia does not have a mate...