I only have 1/??? Riptide Rings. I know the Riptide Ring drop from Enki is unavoidable and I read that another one is in Sulyya Springs... But I can't find it. I literally just scaled out the place for about five times now.
And 1/??? Water Charms. I got one from the Font of Namva, the chocobo place and crap. If there is another Water Charm, I could dismantle it for an Aqua ring and do my magic then.
There are six in total. The Item Location Guide is really handy for finding things for Treasure Hunter.
You know that you don't have to have all equipment in your inventory at the same time, right? You can take an Aqua Ring, transform it into a Riptide Ring, and transform that into a Nereid Ring and that counts as having all three. As long as you have had a piece of equipment in your inventory at some point in the game, it counts. --- CWLSIV