I just finished making some chicken and rice. I measured them raw but I made too much chicken and prior to cooking I was gonna use what I need 300g and save the 187g for the following day. Is that wrong? I mean after cooking the value will be altered now right? So would you say its best to weigh out the exact raw quantities needed?

Also with the effect of cooking does one need to add to it to balance it out?

For eg

I need 150g of chicken for my second meal. If the cooking method adds weight or minuses weight should I add enough chicken to equal 150g? That could be water from the pot or should I minus it if its higher? Can someone simplify this? Thanks so much in advance.