A3 coolant question
 

so my coolant is at the min level, and i called the Service Dept today -- of course they are closed. in the manual it says only use the specific Audi coolant.... i'm leaving tomorrow (Sunday) for a 1000 mile roadtrip, and would like to know if anyone can give me some info on what to do. can i add a bit of water? i'm pretty sure i can't use some random brand of coolant. hmmmm...

thanks!
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Distilled Water is fine.