Where can I buy deionized water for my coolant system?

[battmiceter]

I've found out I can't use tap water when renewing my anti freeze, where is cheapest to buy deionized water?

[Guest 2]

I've used tap water in my cars since I passed my test and never had a problem.

See here - http://www.vwaudiforum.co.uk/forum/showthread.php?144356-quick-(daft)-question-about-coolant-water&highlight=

[R0555Y]

If you have a dehumidifier, or know someone that has. Use the water that's been collected.

[chody]

or condenser tumble dryer

[NickPicks]

Halfords sell it. At £2.50 for 5 litres, it's cheaper than Evian.

Most people use tap water. So long as you've got enough G12++ in there, it'll be fine.

Some say that water from condenser tumble dryers might have clothes softener residue in there as well.