Coolant questions

If it is for emergency use, consider a jug of drinking water instead. It won't matter if your existing coolant is diluted a bit since the weather won't be below freezing and the concentration of minerals in a gallon of filtered drinking water isn't enough to harm anything, especially not short term. You can also drink the water if you get stranded, or bathe in it, but you can't do either with coolant.

And yes, add it to the overflow reservoir.
 
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