I will just leave this here... water cooling raspberry pi : r/raspberry_pi
Raspberry Pi Water Cooler : 8 Steps (with Pictures) - Instructables
Green Water Cooling Block Kit for Raspberry Pi 4 - Etsy
Water-cooled Raspberry Pi Cluster : r/watercooling
Amazon.com: Yahboom Raspberry Pi Quiet Cooling Fan for Raspberry Pi 4B 3B+ 3B Intelligent Temperature Control Programmable RGB(OLED Display Include) : Electronics
Liquid Cooling Overclocked Raspberry Pi With Style | Hackaday