Mayo Clinic says this about salt:
"Various organizations, including the National Academy of Sciences' Institute of Medicine, have published recommendations on daily sodium limits. Most recommend not exceeding the range of 1,500 and 2,400 milligrams (mg) a day for healthy adults."
Read more here:
http://www.mayoclinic.com/health/sodium/NU00284
So if cottage cheese is one meal, that's well within your daily allowance. I guess figure 500 - 800 mg per meal is okay, and of course 500 is better if you need to cut down for health reasons.
I have to add that this surprised me. I thought we were supposed to limit salt to 1,000 mg/day. So it's more generous than I thought.