Question regarding diluting nutrients with ph balanced water?

I try and mix 5 gallons of nutes at a time to take some of the hassle out of it all. My question is, if I make 5 gallons worth of nutrients for a specific stage of growth and don't use it all can I dilute it with PH balanced water without rechecking the PH levels of the diluted mixture? Thank you for your time.

I say you try and check it any time you are about to pour it into plants