So…depending where you live, water is a very bad idea. I live in cold Canada, shit freezes fast. If you were to put water in a radiator or even the washer fluid resi, everything is gonna freeze, crack, and probably mess up a lot of things
Ideally you want to mix 50% coolant and 50% DISTILLED water. Not tap or spring. A lot of companies do make pre mixed coolant, which is probably ideal for your case
Is your radiator drained? If so, search up how to fill it on YouTube as there is a lot of steps and I don’t wanna type it out. Very easy though
As far as your windshield washer fluid goes. Just go to the store ans buy an actual bottle it costs like $5!!!
Hope this helped!
Looks like you got extremely lucky to be honest. But definitely keep your eye on it