It is highly recommended to use magura blood, which believe it or not, is the same fluid they use in there mtb brake levers.
Clutch doesnt hold alot of fluid, youll waste more in the purging process(dont reuse obv)
If for some reason you go through a whole bottle, chances are you could source some from your local mtb shop.
Btw, clutch bleed is quite retardedly easy..enjoi
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