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Give them 3rd dimension (ie. water tank), make droplet that can grow and divide and maybe you've got origins of life.

But then you would lose the evaporation that is needed for this phenomenon to occur.

Weightlessness could give 3d with evaporation.

Evaporation could be replaced by any type diffusion in this system. I imagine a similar process could arise out of difference in salt concentration.

Edit: Updated to clarify the relationship between evaporation and diffusion.

It is a phase transition, it takes energy to evaporate because of the change in entropy/volume (from Clausius Clapeyron).