With only two Water Deities though, I'd like to see what you've got in mind.
Okay here goes a quick stub--too much evil lately, let's have someone nice and friendly:
Galatea, Goddess of the Waters
The Blue Lady, The Dolphin Queen, The Azure Calm, The Soothing Mist, The Flow that Connects us All
Enworldian Greater Deity
Symbol: A gentle drop of water that becomes a mighty ocean as it falls
Home Plane: ???
Alignment: Neutral Good
Portfolio: Water, Oceans, Serenity, Gentle Sea Creatures, Commonality of all People and Animals, Travel, Soothing
Worshippers: Merfolk and other Good-aligned aquatic races, Intelligent sea animals, Nymphs, Fisherman, those praying for bountiful water or rain
Cleric Alignments: Lawful Good, Neutral Good, Chaotic Good
Domains: Water, Good, Weather, Travel, Healing
Favoured Weapon: