I want to make a water heater from an insulated 50 gallon bucket, but I could easily use a different size container. I tried doing things the easy way by just looking for an immersion heater than can be plugged straight into an outlet, but all I can find are travel heaters for making coffee. So I've decided to use a normal water heater element setup. But I don't really know anything about them. What do I need to put the element in the bucket to heat water?