There is a bit more technique to doing it properly than can be stated in a short article, so you should get additional guidance before attempting it, but here is the general approach. Sodium and chloride are the two halves of ordinary table salt, so they're especially easy to supplement. The other five macrominerals are readily available in various supplement tablet and other forms in supermarkets and healthfood stores. The labels on the containers tell you how much of each mineral is being supplied, which makes it easy to get enough. But although it's important to get enough, it's also important not to get too much.
Mineral supplements make it especially easy to take too much without noticing.
The best way to ensure you get enough but not too much of each of these when dieting is to keep track of what kinds and how much food you eat and check the macromineral amounts this food gives you using a food composition table. Then you take supplements to get the total up to the recommended daily amounts - but not much higher. Nutrition-tracking computer programs are the easiest way to do this, but it can also be done fairly easily with paper charts and tables designed for the purpose. Of course, if you have any kind of medical condition, or are taking prescription drugs, you should never take any kind of dietary supplement without first informing your doctor. In my next article, we'll discuss another substance that makes you fat when you don't get enough, but which is also easy to manage when you know how.