You don’t have time for any of this. You just want cold water now. Fine. Grab a metal spoon, stick it in the freezer for five minutes, then drop it into your warm glass. The metal conducts heat away from the water faster than probably anything else in your kitchen.
To become a true master, use a copper spoon if you have one. Copper is the king of heat transfer. It’s like giving your water a tiny, metallic speed boost to Cold Town. If you don’t have a copper spoon, just cry a little and use a regular one.