Take water volume or total volume with formula to calculate volume consumed

For 180ml of water with 6 scoops of formula powder, do you take the water volume (180) or the total prepared volume (200) to calculate how much your baby drank?

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depends, if I'm at home, I'll put 180ml of water then put the powder. if I'm bringing to ifc/childcare, I'll put powder in dry bottle and label with "put water till 200ml" mark.