@Charter Has point here, it has to be mixed with water and if you use Filtered or deionized water better. This will give you better protection against rusting internals. filtered water mixed with coolant containing Ethylene Glycol. The reason behind this is that a high mineral content water or Hard water can cause scaling in the system and which leads to choked hoses and engine water inlet corrosion.
I use Filtered bottle drinking water in all my cars. Pls do not use Pure Mineral water. Just noraml Nestle water would do which is Filtered water, not mineral water as Masafi, Jeema or Al Ain found naturally in the middleeast.