Instant Ocean and a number of other bagged/box salt would be better than relying on a distant LFS
. You can easily mix your own and mail order salt if needed. The LFS
would most likely carry RO
wtaer that you could use to mix your own though. Check other water supply sources in yur area to see if they have it. Tap water to mix with can often have too much phosphate or other unwanted chemicals. The bagged salt mix will give you the instructions for the amount of salt and water to mix to obtain desired aslinity levels. Gonna need a hydrometer to measue the results.
Read one of the good start-up books. Robert Fenner's Conscientious Marine Aquarist is a good one. And don't rely too much on "what you hear". Do some research. Surf on it.