its hard to beat the efficiency of good old icedcubes from the freezer but maybe https://www.longan-labs.cc/2070012.html something like this can be rigged into the glasswork of a bong. that or use a real watercooler modified with hoses/bowl and a quick drain. might be a thing oneday if you can keep all glass on the inside of the bong.
260w self cooling bong, got a bit carried away during quarantine and built this beast with 2 100w watercooled peltier modules
byu/Bongsmith420 inStonerEngineering
