if there is only one set of numbers on the package it is for only what is in the package. as long as you live in the us, the info on the container is for the product in its as is state. so frozen stuff is for frozen, unpopped popcorn is for unpopped kernels, pasta is dry, raw chicken is for raw chicken.
so if you made your packet with milk, you would enter the packet and the milk.
if there are two columns of nutrition info, the second column will likely include what extra thing it was made with [for example mac and cheese typically has the first column as it is in the box, then a second column as prepared with butter and milk as per the instructions].