Never take yourself off of blood pressure medications. It's dangerous if you don't know what you're doing and besides, doing such a thing is your doctor's job.
If you want to permanently come off blood pressure medication, you need to make a small change in your lifestyle. You need to stop drinking soft drinks or whatever water substitute you're using and start drinking a lot more water. As for the "avoid salt" advice, ignore it.
While it's true that we get too much salt in processed foods, doctors who give out this advice don't give enough credit to the design of the body to take care of itself.
Your salt intake comes from the same place you get all of your other vitamins and minerals - from food. When was the last time you heard a doctor tell someone, "avoid Ribovlavin" or "Maltodextrin" because you're eating too much?
The fact is, like a long list of other nutrients you consume daily, salt is eaten in excess quantities. The way the body handles this is to use what it needs and discards the rest. It does this with salt as well - whenever you lose water from the body you also lose salt.
The reason the body retains salt is that you don't drink enough water and the salt retains water from food as a defensive measure to prevent cell damage.
The ONLY nutrient your body needs in quantities and doesn't get it from food (in sufficient amounts) is water. The only way to get water is to drink it - which many people don't like to do.
Every function in the body is tied to water and water regulates every function. Blood is 94% water. When you get dehydrated it loses 8% of its water volume, which causes it to thicken. This is the medical profession's link to high blood pressure. They see the extra salt and blame it on holding too much water in the vessels - when clearly, such is not the case.
The water that salt attracts is stored in the area outside the cells. This water is used specifically to inject into the dehydrated cells - it is not part of the water volume in the blood. The raised blood pressure is needed by the body for this injection process.
You need to avoid water substitutes and drink more water - since the body loses around 2 quarts of water per day, this is the minimum you should drink to replace it. Once the dehydration is corrected, the blood pressure should go down on its own - if done regularly, it could fix itself within a week or less.
But again, do not take yourself off of medication - you need to let your doctor do it so he can check you over and give you an all-clear.