I would NOT use a constant stream of water, the whole idea of the meguire's detailing spray is that it has the right amount of lube in it, that it is neither defeating the purpose of the clay nor is it too abrasive. Straight water has no lubrication in it. You want the clay to glide on the paint, not be overly abrasive against it.
The meguire's is a good choice. But if need be, use a proper dilution of car wash soap, or to be safe, less soap than you think you would need.
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