You put it into a 15-liter vessel, about three gallons, and it'll cool it down to just above freezing -- three degrees above freezing -- for 24 hours in a 30 degree C environment.
Lo metti in un serbatoio da 15 litri, tre galloni circa, e si raffredderà fin quasi a congelare, tre gradi sopra il congelamento, per 24 h, in un ambiente a 30 C°.