Ok where i come from it gets hot.
Homemade swamp cooler box fan.
They are essentially fans that blow air through pads soaked with water.
Set the bottles 6 in 15 cm in front of your fan.
So hot that beer evaporates while in the bottle also the fact that my room gets a lot of afternoon sun does not make for a cool night in summer being the person i am i hacked an old newly bought bucket to create.
This video demonstrates how cool the air being circulated can be.
A table fan or box fan will work best but you can use any fan you want.
Swamp coolers are not complicated pieces of machinery.
Turn on the fan and put your bottles in front of it.
Swamp coolers are examples of evaporation heaters.