The usual culprits for coolant escaping are the radiator, oil cooler pipe and heater core bleed screws.
750ml of water isn't a lot in terms of diluting whats in there (10 litres). I'd grab a couple of litres of concentrate from wherever and put that in neat for the next top-up then use the old container to make a 50/50 mix. Any modern red / pink coolant will be compatible.
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