This is where I get my salt from, you may be able to get it at your healt food store.
Also there is some good information on this site. Basically I mix up my water in a 1/2 mason jar and put 1/4-1/2 tsp celtic sea salt in there. Drink on it during the day. Glassfuls at a time.
I just had my amalgams out in June and someone said that could be helping my BP too. I know the salt helped because I would have my BP taken then then the next day drink the salt water and have it retested and it would be considerably down.
Let me know if you decide to try it and how it goes.