You can get water stones by finding blue shards somewhere in the sea between lilycove and mossdeep once you have 1 go to the treasure hunters house he will trade you it for the blue shard p.s. they're slightly difficult to find
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Water Stone...Well... If I remember correctly, there's a guy who's willing to trade a water stone for a Blue Shard. Oh! And you can find one on the Abandoned Ship.
Abandoned ship, Rm. 2, while trying to get the Scanner after diving.
you will find team aqua in the under water cavern near the dive point in sootopolis
go underground and look for them
In the waters of the safari zone