How do you keep your insulin cool every day in summer temperatures?

This thread reminded me of a previous post from @Michel.

Keeping insulin cool when traveling: wide thermos Tips

My T1D son and wife are getting ready to spend 2 weeks on the west coast of Costa Rica, in a place where temperature frequently reaches 100F and humidity often hits 90%+. I have been experimenting with different ways to keep insulin cool with as little risk as possible. My latest experiment is the best one, and, I think, a winner. This is what I get after leaving it exposed outside in WI heat for 24 hours (yesterday was mid-80s in shade): [KleanKanteenExpTempP2017-07-30] Here is the experiment…
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