The Free Market (holy be thy name) gives you the choice between $1/bottle for milk with chalk and bleach, or $10/bottle for one with less chalk and bleach. If you want one without chalk and bleach, you'll need to find your own cow.
Also, the cows all have birth defects and need uranium-powered antibiotics to stay alive.
Now, let us open our song books to number 34: "Praise Hayek and His Perfect Mustache".
Excellent idea! I'm sure that information will be readily available from independent trustworthy sources that are not the government! Failing that, I always have my trusty mass spectrometer in my kitchen and I run all my foods through it just in case!
Well that's why you need to do your own research. As in looking at products under microscopes, doing physics equations, etc.
If you're not an expert on every product you purchase (and the science behind them), well then that's on you and your kid deserves getting lead poisoning from his band-aids.