Waterfall stacking: Can you leave your tripod and ND filter at home?

Teru Rinshou wrote:

I can understand the desire for creating the smooth "smoke in a wind tunnel" effect to portray tranquility, but the boiling sandstorm cloud effect has its uses too. I can think of some scenes where the juxtaposition of rough waters with a tranquil background would result in a pretty interesting photo.

I'm happy to have this tip in the back of my mind in case I ever find myself without an ND filter.