Convert Free base to 2HCl form I've been using this drug SID 347829124 - PubChem in my experiments from a vendor that supplied it as a $\ce{. 2HCl}$ version, and I switched to another supplier that has a free base instead. The two compounds have different solubility  in water and it would be desirable for me to obtain the $\ce{. 2HCl}$ form to avoid using $20\%$ dimethylformamide to solubilize the free base powder. I thought that using water with a stochiometric quantity of $\ce{HCl}$ would do the trick, but if somebody from the community could confirm this it would be very helpful.
It should work but it is not guaranteed and will depend on application. Drug efficacy is sensitive to the polymorph of the drug and for that reason, a slight change in manufacturing requires a complete redo of any certification process. I assume you are not in the manufacturing business, but it is something to consider and be aware of that your results may vary just by this simple change.