Is there any substance that's a 0-0-0 on the NFPA diamond? Basically a perfectly safe chemical.
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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