You shouldn't really use distilled water as it may oxidize with the metal parts in the radiator. Rather use the OEM coolant mix.
I would also check out the coolant level sensor if it was almost dry and you didn't get any warning. I had a coolant leak and got a warning with only around 700ml missing.
Alpina_B3_Lux
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Audi R8 LMX, BMW M550i xDrive (G30 LCI); gone: Alpina B3 3,3 (E46), BMW 335i, Audi R8 V10 manual, Audi R8 V10, BMW M235i, BMW 550i F10
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