Last summer we went to my brother's house for the 4th of July. It was an especially warm summer, and his window-box air conditioner had a tough time keeping us cool.
So my brother's wife made a big jar of cucumber water to keep all of us hydrated. It was very refreshing!
Get one of those clear jars with a spigot on the bottom, like people use for iced tea or lemonade. Fill it with ice water and sliced cucumbers. Allow the cucumbers to steep in the water for at least an hour before serving.
It's as simple as that!