Hello PF, I'm working on a little project where I would like to chill and regulate the temperature of water. I'm looking for a fairly cheap way to keep approximately 2 liters of water somewhat cold. I've been looking at some thermoelectric coolers and stumbled across these on amazon. Three questions: What would be a good way about water proofing these? It's possible that there are better alternatives to cooling water. Can you think of one?