DIY aircon
Link dump
Copper tubing and fan, radiator and fan
Page showing two methods. One uses copper tubing and an existing fan, whereby cool water is pumped into the tubing using a simple fountain pump. The other takes a radiator, and pumps water in through a water outlet (a tap with threading) and places the radiator in front of a fan.
- https://www.wikihow.com/Build-Your-Own-Air-Conditioner
A couple of videos on the same:
- https://www.youtube.com/watch?v=3V93Gh3Q2Ro - https://www.youtube.com/watch?v=ZF0J8OvDSmM
Ice in bottles in front of fan
For an emergency quick fallback, there is the well known ice in front of the fan approach. While very simple, the use of simple plastic bottles makes sense as they stand upright and the air can be channeled between them.
- https://www.tomsguide.com/how-to/how-to-make-a-diy-air-conditioner
Ice chest, cooler box
Slightly more involved but interesting: