Selling water..

If you believe in homeopathy, you ought to read this wikipedia entry. Excerpt:

... The therapeutic potency of a remedy can be increased by serial dilution of the drug, combined with succussion or vigorous shaking. ... Homeopathic remedies of a high "potency" contain, with overwhelming probability, only water. Practitioners of homeopathy believe that this water retains some 'essential property' of one of the substances that it has contacted in the past. However, water will have been in contact with millions of different substances in its history. According to this molecular paradigm, any glass of water must be regarded as an extreme dilution of almost any agent you care to mention. Thus, critics argue that by drinking water one receives homeopathic treatment for every imaginable condition.

Hmm. It seems that if one drinks the mythical 8 glasses of water a day, he would be very fit.