Hi stlhaunted, I wouldn't recommend adding salt to your drinking water, but it's OK to use on your food during meals and in the water for cleansing enemas.
I usually suggest a salt water cleansing enema before taking a coffee enema, and some even recommend a follow up salt or plain water enema after the coffee enema to help clear out the waste and toxins released by the liver.
The cost of the initial consultation by that ND is outrageous!
You have my sincere wishes for the best of health,