Chilling water in copper vessel Does chilling drinking water in copper bottle result in any chemical reaction that turns it dangerous for consumption in any way? 


Few days back, in summer, I carried kokum juice in copper bottle. I had a sip of it after some time when I reached office and I felt super dizzy. I felt that traveling might have an effect on me, so I stopped. I had another sip of juice after some hours I had a strong dizzy feeling. At first, the juice tasted ok but then it started tasting very very weird. When I reached home and poured the juice back out of the bottle, to my surprise, its green! The normal color of kokum juice is pinkish-reddish. So somehow copper reacted with the juice and possible resulted in some acid, even though it was at normal room temperature (or in fact cold one as the juice was prepared from cold water). I believe there shouldn't be an issue with cooling water in a copper bottle in the fridge, I just want to know if there is any slight drawback, maybe from Ayurveda point of view? Also, I hope you get the chemistry angle to this question.
Do not do it !! ( putting acidic, or rather any juice to copper bottles )

You are in danger of copper poisoning.

Generally, by food processing laws, copper is not allowed to be in direct contact with food, as there is danger of copper contamination.

Especially acidic liquids, like vinegar or citrus juices, directly slowly dissolve copper in presence of oxygen.

$$\ce{4 RCOOH + 2 Cu + O2 -&gt; 2 (RCOO)2Cu + 2 H2O}$$

Note that cold liquids contain usually more oxygen than warm ones.

For similar reasons, even if there is not copper, it is very bad idea to keep the content of conserved fruit cans in the already  opened cans. You can otherwise see the juice corroding the can inner coating in air presence.

Soluble copper salts are usually blueish/greenish what with yellow/orange colour of juice gives green colour.

Long term usage of copper for keeping water is on the edge. It can cause chronical low dose sneaky poisoning, especially if water is treated by chlorine.

$$\ce{Cu + Cl2 -&gt; Cu^2+ + 2 Cl-}$$

Oxidation can lead to partially soluble basic copper carbonates, soluble by traces of organic acids, related to minerals malachite and azurite.

$$\ce{2 Cu + CO2 + O2 + H2O -&gt; CuCO3 \cdot Cu(OH)2}$$

$$\ce{3 Cu + 2 CO2 + 3/2 O2 + H2O -&gt; 2 CuCO3 \cdot Cu(OH)2}$$

Plus, there is danger some people would want to store there other liquids than water as well, as the OP.