I have never used Mrs. Stewarts but rock salt and water worked great for me. I was able to put it in the freezer and the herring were never frozen but stayed usable to a good 2 months. Don't know why it worked but it did.

If you are out in GH and you see the anchovies, catch a few and use them. 2 on a hook gives it a nice flip flop movement with the trailer hook set right at their tails. Is the only thing I have ever managed to get a bite on while trolling.