If your tank became septic, take it to a mechanic, probably just needs an oil change. Then you can shit in it and fire said shit to whoever it concerns, sincerely, and with love.
Idk, needs more steps, put a Peltier in it, a heat exchanger with a second loop, and don’t forget the compressor for extra chill.
And also make it so that the end radiator doesn’t radiate heat into the air but into the ground instead, so that it won’t be just air cooling with extra steps.
Someone once introduced their gf literally saying "We are in a relationship" - it’s sounds awkward/clunky but I didn’t even notice that, it didn’t make me think for a moment, its precise, short, and above all clear. I appreciate direct communication way more than ‘what sounds nice’.