Turns out it was super simple to do, its a single line change for each cereal, I could give it to you so you can add it to the mod itself, it makes it so it will recognise any milks added by other mods

so I made that small patch, but its a bandaid fix, with your permission I'd like to make a Rebalanced verson of the mod. Currently each box of cereal makes the vanilla bowl of cereal, so it looses the carbs/stats the different cereals have, often making it way better to eat them raw than make a bowl of cereal