Is there any substance that's a 0-0-0 on the NFPA diamond? Basically a perfectly safe chemical.
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You can find plenty of others if you perform this search on Wikipedia (but then, go check the MSDS for the individual compounds before doing anything serious with them).
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$\begingroup$ I think this does not hold for all "types" of water. Imagine what pure water could to the the osmotic pressure in your cells. I don't know for sure, but I wouldn't drink a liter of distilled/deionized water. $\endgroup$ – Jori Aug 24 '14 at 22:46
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$\begingroup$ A liter in your stomach would probably be ok, a liter in your lungs would cause trouble. $\endgroup$ – user137 Aug 24 '14 at 23:00
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