Sounds like a challenge.
I've seen DIY versions of the 'better beamer' flash extended that might suit the job. Basically a large Fresnel lens, on a reflective cone. The distance & focal length of the lens being chosen for the distance the beam needs to travel...
Another option might be to get you light closer to the waterskier. If you can arrange powerful LED lighting in a waterproof enclosure fastened to the ski rope, it should be possible to add some light that way.
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Mike
Pentax K5ii & Panasonic G5 user (with far too many bits to list)
Member of North Essex Photographic Workshop
Also online with PentaxUser.co.uk, Flickr, MU-43, MFLenses...
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