Metal vessels - The water kept overnight in a pure copper vessel, has antimicrobial and antioxidant properties. Copper can be used in rainy or winter season.
Silver is a good choice in summer as it has pitta cooling property and is antimicrobial.
Earthen pots – In summer clay pots are very good for drinking water storage as the clay is alkaline so it balances the acidity of water. Also they provide natural healing from the elements of earth. They are better than fridge water as they are gentle on throat.
Glass – They are neutral in their effect, no benefits and no harm so water can be stored in them.
Stainless steel – it can be used to store water.
Aluminum and plastic should be avoided for drinking water storage as both are harmful because of their chemical composition.
Some Important facts about copper vessels
As set by WHO ,the water stored in pure copper vessels have well within the the permissible limit of copper that is 2mg/liter .If it goes above 2/5mg/liter then the stored water will have a change of color and a bitter taste.
The copper vessels can be cleaned from outside preferably every day with vinegar or tamarind or lemon with some salt then thoroughly cleaned with water. For inside boil one tablespoon of salt and one small cup vinegar and leave it inside for a few minutes and the scrub inside. The artificial cleaning agents are rough for the copper and they are harmful for the digestive system as they are ingested along with water.
Drink from a copper vessel for about three months and then leave it for a month and then you can again start drinking from a copper vessel .This will take care of any excessive absorption.
Never heat or prepare food in uncoated copper vessel. Do not store any curries in them.
Never keep or drink hot water in a copper vessel.
http://www.ishafoundation.org/us/blog/properties-of- copper/\ http://www.homeoint.org/morrell/articles/pm_metal.htm