Drink water, but not from cups of non-Muslims

e2.1 Purification is permissible with water from any pure container, except those of gold or silver, or those to which enough gold or silver has been applied that any of it could be collected from the vessel by heating it with fire (N: meaning that if the vessel were exposed to fire, the metallice coat would melt and separate from the container, even if not drop by drop). Such containers or utensils are unlawful for men or women to use in purification, eating, drinking, or other use (O: of any type whatever). It is unlawful to acquire such a container or utensil even if one does not use it. Even a small eye-liner stick of silver is unlawful.

e2.2 Vessels soldered with gold are absolutely unlawful. It is unlawful to use a vessel to which much def:14.5) silver solder has been applied by way of decoration; permissible to use a vessel to which only a little silver solder has been applied by way of a needed repair; and offensive but not unlawful to use a vessel to which only a little silver has been applied for decoration, or much out of necessity.

Solder means that a part of the vessel has been broken and then silver is put there to hold it together.

e2.3 It is offensive to use the vessels of non-Muslims (N: before washing them) (O: to be certain of the purity of the vessels used, since non-Muslims are not as concerned about purity as Muslims are) or wear their clothes (O: for the same reason).

e2.4 It is permissible to use a vessel made of any precious gem, such as a ruby or emerald.