Distilled water....

Not sure about the dryer water.

Halfords sell de-ionised water for batteries.

When I first was researching ormus/concentrated seawater I bought halfords de ionised water to use. But then I found out when you open the container it'll go from pH 7 back to atmosphere pH roughly 6.3.

So me being a fussy fella bought a distiller on Amazon to use. It's basically an electric kettle that boils the water to steam and it's collected in a pot beside it.

But for batteries that de ionised water should be OK. It'd be free of impurities anyway.

In theory possibly, in reality no.

It would also contain traces of formaldehyde and detergent. You can tell it's impure because you can smell the fragrances of these chemicals

No. Purified will have gone through filters so depending on the filters could still have a lot of contamination in it, minerals and other dissolved stuff, distilled should be nothing but H20

Picked some up at Tesco before in the car section, sub €5 from memory for a 5 litre jar.

put a bucket out and you will have distilled water when you get up in the morning

We get it out of the rain gauge

I just use any coolant, is there a difference