Not sure if you mean with droplets of water? If so, as per above. I have a supply of Baby Oil, which, while not being hypoallergenic is (hopefully) the mildest around. Then a warm water spray. Doesn't stay warm but at least it doesn't give a shock.
If you've not used oil before it's worth taking a couple of test shots, it's very easy for the model to (a) miss a patch, or (b) leave a big streak of thick oil on the edge of where she's spread it. Also things like baby oil is designed to be absorbed, so it is! Which means that it can quite quickly make the outer layer of the skin less hydrophobic, so the water doesn't bead so much for so long.
I'm guessing a good dollop of molten lard would last a while.... (insert puking emoji here)