You may find it very hard to differentiate between water and distilled water if you are using how they look like the basis of your comparison. Most times, people get to know which is which only by labeling them. While we are all familiar with the regular water, which has the chemical formula of H20, the distilled water is another type of water that has passed through certain processes.
The regular water contains different kinds of minerals, most of which cannot be seen at times since they are also soluble in water as well. Also, untreated water can also have different kinds of microorganisms inside that can cause different kinds of diseases.
Distilled water, on the other hand, is a type of water that has been purified through a series of distillation processes that are quite simple. This type of water doesn't contain minerals, microorganisms, and any other contaminants. Distilled water is used mostly for different kinds of experiments, and can be recommended for patients with certain health problems.