How to Make a Coffee Presco

The first year i was making this presco i was using just tap water. It turns out there's away too much salt in it, which was really good for flavor. In honolulu it's just like, s so much salt here is is surrounded by salt air, salt ocean. So when i stripped it down the water, my coffee tasted terrible, but i knew my machine was safe. And that's what led me to this product.