With already one water type in his team i wouldn't consider using another one or even swap it for Wartortle, even though I must say, it's really a great choice for NU. However, I decided to sum up the (in my opinion) best spinners available around there in conjunction with their def stats, maybe you find something, you can fit in your team:
Eviolite users:
Wartortle 59 / 80 / 80
- great bulk, pure water type, Rest or Aqua Ring + Protect to recover some health, Rain Dish can be used as well
Sandshrew 50 / 85 / 30
- ground type gives resistance to SR, but it's damn slow.. Super Fang and Toxic to break through stall?
Tentacool 40 / 35 / 100
- impressive SpD, Poison type to resist Fighting type moves and absorb Toxic Spikes on the switch
Shellder 30 / 100 / 25
- abusable physical def, no Ice type = no SR weakness, access to Shell Smash but lacks Rock Blast and non-STAB Icicle Spear
Staryu 30 / 55 / 55
- still decent bulk, fastest Eviolite using Rapid Spinner in NU (Base 85), access to a reliable recovery move and mind game options possible with 'Reflect Type'. Else access to dual screens.
Pineco 50 / 90 / 35
- pure Bug type, nice psyical def, resists fighting type moves but weak to SR. Can lay out any sort of hazards by its own is a huge plus, and can set up dual screens
Baltoy 40 / 55 / 70
- Levitate > immunity to Spikes, T-Spikes and resists SR, nice typing and useful resistances, but lacks offense at all. Dual Screener
Drillbur 60 / 40 / 45
- another Ground type, packs useful Base 85 Atk and 68 Spe, access to SD
Non-Eviolite users:
Smeargle 55 / 35 / 45
- all-in-one weapon. Access to literally everything, but Rapid Spin + Spore makes it pretty viable already
Torkoal 70 / 140 / 70
- only spinner with Will-O-Wisp and Lave plume to spread around burn status (apart from Smeargle and what can use Scald), can use Shell Smash, Iron Defense and Amnesia to set up. Access to Clear Smog avoids it becoming setup fodder. SR weak.
Spinda 60 / 60 / 60
- looks weird but works. Moves like Trick, Wish and Sucker Punch is what make this thing decent enough to at least give it a shot
Armaldo 75 / 100 / 80
- Rock/Bug dual type makes it weak to SR, but with access to moves like SD, Rock Blast and X-Scissor combined with very nice Base 125 Atk, you're running a quite safefly offensive set. Base 45 Speed is kinda hindering though..
Cryogonal 70 / 30 / 135
- impressive SpD and fastest Spinner in NU (Base 105). Pure Ice type makes it weak to SR, but STAB Ice Beam will hurt a lot. Can set up Dual Screen, has a reliable recovery mov, Haze and many other options. Levitate is just a nice bonus to all of it.