Just use tap water.
The anti-freeze has chemicals that will neutralize any contaminates in your water. If you can drink the water, it is safe to use in your car.
How important is it to use distilled water when changing your coolant in your car?tap water has minerals and salt and other elements that do not do well in the cooling system, not to mention chlorine, these can ruin gaskets, cause excessive rust inside the block, and clog the radiator, filtered drinking water may be used also, but distilled is the best, How important is it to use distilled water when changing your coolant in your car?I think that's for batteries..How important is it to use distilled water when changing your coolant in your car?It's not really as long as you mix the water with coolant.Otherwise no you could pi ss in it,as long as the engine runs at the correct operating temp it's fine.How important is it to use distilled water when changing your coolant in your car?It is always best as a way to keep contaminants and unwanted mineral deposits from building up in your cooling system. How important is it to use distilled water when changing your coolant in your car?R.O. (Reverse Osmosis) water is the safest water when you're just using it to get something else out of the way without leaving something in. Literally all it is, is H2O. no minerals, salts, carbs, fats, artificial flavors...i.e. exactly what you need when you dont want any sort of deposits in your cooling system.How important is it to use distilled water when changing your coolant in your car?it is as said very important. mineral deposits can build up over time and create a barrier between the cylinder walls and the coolant and then heat transfer becomes poor and hot spots are made.
