Ok thank you. Here in Romania you can find deuterium depleted water Nature rediscoverd by science, purity of water - Qlarivia.comThe ketogenic diet is not praised here.
You can have a look at deuterium depletion for cancer: Deuterium Depletion: A New Way in Curing Cancer and Preserving Health by Gábor Somlyai.
Deuterium depleted water is rather costly (but it's managable I believe, and still far less than the real cost of standard therapies), which is an issue.
and it is not overly expensive