There was a study which showed every person resonates with different frequency, as their corresponding water molecules showed. I will try to find the link of that video, saw it some time back.
I think this theory is not far-fetched, but then, I am also open to believing in alternate universes where our doppelgangers exist :) I mean, why not? We have very limited knowledge, and we are not the only creation.

This is off tangent, but look up the phenomenon, neuro-plasticity. If DNA can be changed by constant thought patterns, then there is every possibility that water molecules retain memory capacity.