I've never witnessed my snakes drinking from their shed bath water. But I've been using that method for quite some time now. And thank GOD all my snakes have been in good health. I would assume that the water is harmless being that the labeled product has no warnings about the snakes ingesting the diluted solution. If it was harmless, I would assume they will acknowledge the public to avoid legal issues. Zilla is a very popular company in it's Industry for many years.