There are various methods to produce pure water or deionized water. Deionized water has various benefits that is why it is preferred over tapwater. You can buy deionized water through ancpurewater.com.au/.
According to Genetic Engineering and Biotechnology News, there are three major types of laboratory-grade drinking water:
Type 1. This is ultrapure water with very small levels of Ions (resistivity 18.2) organic compounds, bacteria, and particles. It is typically produced by combining purification methods like activated carbon reverse osmosis (RO), ion exchange resins, ultraviolet photo-oxidation electro deionization, and filtration. It is utilized for techniques for analysis, such as HPLC, high-pressure liquid chromatography (HPLC) gas chromatography, and inductively coupled mass spectrometry in plasma (ICP-MS). It is crucial for reagents as well in the preparation of equipment for molecular biology as well as cell culture.
Type 2. This type of water is also known as pure water. It could have a tiny quantity of ions (resistivity greater than 5) organic molecules (up to 50 ppb of organic carbon total) and, possibly, tiny amounts of microorganisms. This is the kind that is used for making the standard buffers and reagents within the lab.
Type 3. Typically, produced by reverse osmosis or Ion Exchange, this kind of water is utilized to perform less delicate tasks such as qualitative analysis as glassware rinses, as well as water baths.
Contrary to what many believe Tap water is not used to do everything in the lab due to the impurities that are found in it. Organic and organic compounds, microorganisms and particles and dissolved gases are found in tap water, and these impurities could affect the outcome of experiments.