From a Physicist working in the sphere of Biology

A lot.

Unless that stationary body is some kind of molecule fixed or arranged/bounded to a surface sort that would either restrict or minimize kinetic displacements of individual molecules ( each such displacement requiring input for entropy penalty )

Another way of fixing molecules is freezing the water...

PS. If the body refers to a container for transportation and storage, temperature of the water is all you need to know about the average displacement count/interaction count.