Whisky Flask

Hip Flask Question?
I am a whiskey drinker but I drink water, I just got a new hip flask and was wondering how I can measure to half water and whiskey half as you can not say how much is in it (I dont need AA im only 15) if I drink I get drunk without water faster tae so i need to stay sober longer. 50/50 is better is because it contributes to the flavor and keeps you sober longer, my uncle distillry owner of a well to get it for free
1 Complete 2 flask with water, empty the water in a measuring jug 3 Pour half the water away in April, the water poured back into flask 5, Top 6 with whiskey, drink 7, repeat from step 1 until you can not read the lines of the measuring jug
hammer of thor engraved whisky flask titanium