Is tin and tinware toxic?
The Wikipedia article you quoted clearly says:


  The low toxicity is relevant to the widespread use of tin in dinnerware and canned food.


Moreover, tin cookware, which used to be very common in earlier centuries, is still sold for outdoor cooking purposes. It is thus without a doubt deemed safe to use under current health regulations.



As a side note, the pH of coffee is around 5, which is only weakly acidic (same as unpolluted rain, and less acidic than tomato juice or beer):