Is there any way to artificially make salts for humans colonizing planets on a long term basis?
It is given that the exoplanet has a water source. So do we hope for the best that it has salt present or should we make new sources?
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It depends by what you mean by salt. Do you just want sodium chloride (NaCl) and maybe potassium chloride (KCl) or do you want the full range of salts, that also included sulfates, chlorates, perchlorates, nitrates, etc.?
Both Earth and Mars have undergone significant weathering which includes the dissolution of minerals in water and subsequent precipitation of salts of various forms.
Any planet that has undergone a process of weathering and has had or still has large quantities of water will most likely also have natural salt deposits whether in oceans, salt lakes/basins or buried underground.
In these situations it would be a matter of finding the deposits and mining them or if they are still aqueous evaporating the water to obtain the salts.
To manufacture sodium chloride all that is required is equimolar amounts of hydrochloric acid and sodium hydroxide. Both these chemicals are dangerous and need to be treated carefully. Obtaining naturally occurring salts would be a better option.