How to get a cold place to purify lievito madre or how to do it without low temperatures?

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I live in Brazil, Rio de Janeiro, and it's the middle of Spring.  It's humid and hoy here, and I have no idea how I'm going to create a place with a temperature between 15 and 18 degrees Celsius without spending a lot of money on a fermenter/Mini wine cellar.

How did you improvise a cold place in your house? Can the cold purification step of the lievito be replaced with something else? I intend to make panettone. 

A styrofoam cooler with a small, frozen gelpack in the bottom?

A large pot with cool water that you monitor the temp and change out/chill/add ice cubes as needed?

A large unglazed clay pot that is kept moist as an evaporative cooler with a lid? HAH! It has a name and has existed for millenia. A zeer- here is a Wikipedia reference:

Pot-in-pot refrigerator - Wikipedia

A temperature probe would be most helpful for any of these experiments..

In this moment, i trying the styrofoam with lievito and testing the pot-in-pot empty. I will return wich one gave me the best result later.
My.

I Have a little kitchen termometer and i using to monitor the temp. Im afraid of the ice cool so much the lievito.

You don't need a wine cooler. Any cheap (2nd hand?) mini-fridge (or even full size) will do. Buy a cheap controller and plug the fridge into it. 

clazar123's suggestions are also good. 

Gary