Why were Copper water containers popular in ancient times, how good are copper watering cans for plants ?
Copper water refers to water that has been stored in a copper container, allowing the metal to infuse into the water. Copper is one of the essential micronutrients needed for plant growth, as well as for the functioning of your body. . However, copper deficiency is rare, as your daily copper needs can easily be met through common foods.Still, there is also another interesting aspect to why copper utensils were once very popular.
In ancient times, the practice of storing water in copper containers was common. The age-old practice referenced in ancient Ayurveda texts is now supported by several studies. It is believed to help in the water purification process that helps kill harmful microorganisms and bacteria, present in the water. It also helps neutralize toxins.Durham University's Assistant Professor Karrera Djoko — also known as Twitter's @thecopperdoctor says "Copper does actually have very potent antibacterial properties."
(While both its deficiency and excess may be detrimental to your health, copper deficiency is uncommon, as is its toxicity from the use of copper watering utensils. While copper is soluble in water, not many copper ions will leach out from a copper container, also meaning it won't put you at risk from exposure to too much copper .As for plants, Copper toxicity can occur from the repeated use of fungicides that contain copper and rarely from the use of a copper watering can.)
Wren Watering Can, Copper - by Made.comUK 
They’re available in three gorgeous high-shine metallic finishes. Choose from copper, brass or chrome and put any rust worries to bed - they’ve been treated to maintain their shine. Designed with an easy-pour spout.
Here are some copper watering cans, listed in Amazon
For more like this, visit Copper Watering cans listed in Amazon
For other claimed health benefits, refer to:https//food.ndtv.com/health/12-amazing-healing-benefits-of-drinking-water-in-a-copper-vessel-1658134