I personally use a bit more butter like half a stick or like a decent sized spoon full… when mixing make sure not to use to much butter though just enough for it to be a bit more buttery than normal… as for boiling I usually boil the noodles until they feel soft though the spoon… as for milk I usually just pour some in without the measuring cup but that doesn’t really matter much…
as for the amount of water about half or slightly more than half a pointer fingers worth which means stick your finger in the pot to measure… I am nyot very good at explaining this type of thing-nya.
My mom had bought some of the Microwavable kraft mac n cheese, it's different to the ones for the pot, I had just wanted to try the microwave one for an experiment, it did not taste good compared to the other kinds