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I usually smash mine in to a little cooler with ice in a ziploc baggie and I also throw in some of those blue ice things and by the morning everything is still very chilly. Hope that helps
Ziplocs work well but not too many people want to wash a ziploc to reuse it. When done with cooler wash with soap and Hot water (sometimes bleach) and ready to go for the next time
The igloo cooler is a great way to go....also if you're not shy , you can ask at a grocery store , restaurant or bakery and you can get buckets like this(2 gal) for free. Food grade plastic and they work nicely.