Also make sure to get some oral rehydration salts. You don't just lose water with the shits.

It's got electrolytes.

That's generally just the mold itself. While you can have competing cultures the nature of the Penicilium genus means you don't have to really worry about bacterial growth and other mold growth would have competing colours in almost all cases for dairy products. With bread and fatty meats where you might see penicilium you are right to worry a lot more, but the nature of modern dairy means whatever spoils it tends to be monoculture as it's generally a 'whichever infects first has too much of a headstart to allow competition,' when with bread and meat mold has a harder time penetrating the substance (giggity) and has much more competition respectively.

Pasteurized dairy is only vulnerable to so many pathogens that you can kinda guess what spoilage you'll get based on sight and smell (at least down to the genus, it's impossible to get much more specific without a full lab test).