you can find it anywhere....
the foil covering on milk powders cocoa etc.. tins.
in the uk on the covers of chinese take aways...not a wine drinker?go to
a local pub/restaurant and explain your problem to the cute waitress.
look in hardware shops for alluminium tape
if not you'll be foiled again. sorry couldn't resist.
ps; as an alternative to foil you can use tamiya masking tape.and
if you use the tape it would stick on by itself.