Make sure chord does not fall into container with ice. Not recommended for people with children. Use fan that cannot fall into container and short out. Always turn off fan and unplug before removing melted ice. I use large coffee containers that are made out of plastic to freeze water in. No need to seal up container. Just place ice blocks inside and behind fan. Blower fans work well for this. The blower fan I got came with a chord. They come in various sizes and power ratings. A medium size like a Hood vent or an exhaust fan in an RV will do the trick!
Always unplug before you go to bed.