Best way to dissolve and consume cysteine HCl monohydrate powder Does cysteine break down in filtered water?  Should this made more acidic?

If I mix cysteine powder in juice (something acidic maybe), does it remain at cysteine?  It seems that it can oxidize into cystine and lose some of its qualities.
I wouldn't worry at all about the oxidative dimerization of cysteine to cystine when you consume freshly prepared solutions. 

In the lab, you'd use oxidants, such as $\ce{FeCl3}$ (in the presence of air) or hydrogen peroxide to achieve this reaction; both of which you're not likely to add to your amino acid diet!

As far as the article which you mentioned is concerned: The stabilization methods in question will only be relevant to maintain the composition of prefabricated and sterile-packed solutions over a long period of time.