There are actually solutions out there on scaled-down glycol chillers, with inner water tank, for simplicity of use. Water can be used to chill all the way down to 7°C but then glycol should be included to chill even more. We use propylene glycol, a non-toxic choice to ethylene glycol, https://minibookmarks.com/story20189494/getting-my-glycol-chiller-to-work