Is there a free online resource where I can get the solubility of a solute in a solvent?
You need to narrow down your question.  Currently, the potential solutes include NaOH (inorganic salt), dextrose (organic neutral compound), and choline chloride (organic quaternary ammonium salt) on one hand, and on the other hand a wide range of potential solvents.  It is unlikely a single database will (ever) cover such a  broad range of possibilities.

Nevertheless, there are some resources that may be useful to consult.  For example solubility tables like this or the properties tables for some of the compounds in wikipedia, like here.  If you know both solvent, and solute, NIST-IUPAC's solubility database here may be worth to visit.

If your institution / library provides access to Reaxys/Beilstein (a commercial database by Elsevier), you may find solubility data in the category of physical properties. This database covers both organic and inorganic (including metal organic) compounds and will provide you both the numerical value, as well the primary reference.