Can you use "sterile" water to top up coolant??

[dave_s13]

Probably a stupid question this but her goes anyway.

I'm changing the 'stats on my BMW E61 and this apparantly looses about 3litres or so of coolant which will obviously need to be topped up. I have the OEM BMW coolant and I'm aware you shouldn't use tap water to mix it up but wondered if you can use sterile water rather than distilled.

I only ask as I have 3 litres of this stuff knocking about that's gone out of date so can't be used in our medical devices that use it.

http://www.mistrymedical.com/item/9203/baxter-ster...