I actually packed my set of neutral density filters just so I could try slowing down the shutter enough to get the softer look to the water. Unfortunately, that also means little details like leaves on tress might be blurred. Probably a good time to take two shots and merge them afterward.
Picture taken with Sony a6000, EF-S 10-22mm lens @ 10mm, 1 sec shutter, f/11, ISO 100
Had a moment of realization when I got back and looked at these – there is a difference between the 1.5x crop factor of most cameras and 1.6x crop factor of a Canon. Using a Canon EF-S lens on a Sony camera leaves the corners black and forces some cropping.