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While water's adhesive & cohesive forces present severe problems (and benefits) to small objects (insects) the adhesive effects on large powered objects are really inconsequential. Small insects can't even "enter" water, i.e. Break through the surface tension, and if they are forced under can't get out.
I have a helo like the one in the film and they are difficult to fly and very subject to even light breezes. Most Drones, such as the Phantom, are quad-copters having 4 powerful motors driving 4 props which give a stable and strong lifting force. Copter drones also tend to be more wind resistant, e.g. the Phantom states up to 15mph winds.
My main concern would be coming down straight and even on a smooth surface (no waves)