Common salt (NaCl) is used by professionals world-wide when transporting fish in order to alleviate osmoregulatory stress. A diet high in vitamin c before & after can also help offest any stress from a move, but let's just consider salt for now. There are numerous studies/papers that can be found online to support these statements.
http://www2.ca.uky.edu/wkrec/SALTTRANS.htm
http://www.scielo.br/scielo.php?pid=S0044-59672006000400020&script=sci_arttext
Adding various other minerals to the water, may or may not also help alleviate stress, or offer ones fish a better overall environment, often this will be species dependent.
http://www.tandfonline.com/doi/abs/10.1577/1548-8659(1991)120<0121:IOWHAS>2.3.CO;2
Marine salt contains sodium chloride (NaCl) but also contain numerous minerals, the same minerals found in these Asian formulas being marketed for FH etc.
http://www.cichlid-forum.com/articles/aquarium_salts.php
My tap water is fairly hard, with a high mineral content, so when adding new fish to a tank, moving fish, or transporting fish I simply add approx 1-2 teaspoons of kosher pickling salt to a 100 gallons of tank water. Not knowing the exact quantity required for most tropical fish, I tend to error on the side of caution.
Marine salt, sea salt, etc, will all do the same thing and add numerous minerals to the water, along with increasing the sodium content. For very large applications many of the water softening salts on the market found at stores such as Home Depot can also be safely used. A search on MFK should net a few of the local bulk suppliers.
HTH