How to chill a keg of beer<br>Prepare a tub for the keg. To chill a keg, you will need a large, durable container into which the keg will fit with a little room surrounding it. The best option is buying a specialized keg tub, which can be found at many liquor stores and home brewing supply stores.
a trashcan is not suitable for chilling a keg
the context describes using a container, a trashcan would and commonly does work just fine
( z1 suitable :polarity - :ARG1 ( z2 trashcan ) :ARG2 ( z3 chill :ARG0 z2 :ARG1 ( z4 keg ) ) )