Water is vital. All living beings need to drink it in order to be hydrated and for all the cells in our body to function. However, not everyone can access quality water such as rain, so there is a type of plants that we must water with distilled water.
This is a product from which impurities have been removed, but also mineral salts, such as sodium chloride, better known as salt.
Carnivorous plants are a type of plant beings easily recognizable by their traps, which are made for the sole purpose of attracting and trapping their prey. Once they get it, they digest them little by little and use them to grow and develop.
They tend to live in areas where the soil has so little nutrients that they have been forced to "eat" insects.. Taking this into account, one might think that if we irrigate them with tap water, which can have a high salt content, they could be used to stay alive. But we would be wrong.
The process of adapting plants to a new environment takes a long time, perhaps tens or thousands of years. After several generations, we could start to see some specimens that are adapting. So that, We cannot water the carnivores with depending on the type of water since their roots would die if we did.
Distilled water is, for them, a very good alternative to rainwater. It does not have as much quality as the latter, but they do well because it has a low level of mineral salts. Although if you cannot get it, you can also use air conditioning or bottled water as long as its dry residue is equal to or less than 100ppm (parts per million).