I'm not running water at all, at least currently as the event is light. It's just that with only one water SSR + Cthulhu + Ryuuou, that's still 3 slots short of a perfect team of 6 SSRs. (not to mention if using Sol or Ama then that's elemental disadvantage)
Also, I'm personally interested in schadenfreude-esque tales of people saving tons of jewels for anticipated SSRs and rolled into bankruptcy without commensurate returns.