William, I would certainly drink desalinated water from any source provided it had gone through reverse osmosis or distillation (both will remove bugs as well as salts). The toxic compounds in HAB’s are polyethers and much larger in size than the salt molecules you are removing. Should be no problem for a reverse osmosis membrane.
Grey water is already used household water, so is different to desalinated water. I would only drink that if I was desperate. I prefer to put it on my garden instead.
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