Kalkwasser question

I'm thinking about dosing kalkwasser. I do not have a dosing pump so was thinking about mixing 3 gallons at a time and putting in a cup to half a cup every morning to my 120 gallon tank. Is this a bad idea or should I be doing something different?

Better to drip it in with an IV type system just pouring it in will spike ph

Thanks for the heads up, I will look that up