Why don't they just put crystal meth into all the foods and drinks?

Because it would be another sugar.
It would be very costly, couldn't be flavored to be easier to digest for kids and it would probably take a lot of the market that the sugar industry has.
Even then, it's very stupid to put another addiction in the general population, much more if it can´t be profited as easily as sugar and can cause real concerns to the general population.
 
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