Time tested for over 140 years. It should be noted that this amount is enough for subsidence purpose only, two quarts for drinking and two quarts for cleaning and bathing etc. per day. If you have the room to store more you will probably want to do so. Both glass and plastic containers are commonly used for water storage at home. Containers should be clean and sanitary.
Plastic containers are lightweight and substantially more resistant to breakage than glass.
If plastic containers are used, care should be taken to assure that they are made of plastic approved for food contact by the Federal Food and Drug Administration. Polyethylene plastic is approved for food contact and is commonly used for containers of various sizes, including large 55 gallon drums. Leaching of chemicals from approved plastics is negligible. For long-term storage, tap water should be sterilized or disinfected in thoroughly cleaned plastic or glass containers. This level of treatment will kill bacteria and viruses as well as prevent growth of microorganisms during storage.