Slice a lemon and a peach. Put them in a jar filled with fresh water and ice cubes. Add some sprigs of mint. Stir well and let the water absorb the subtle flavours of the fruit. 1/2 hour is fine. Serve chilled.
When I lived in Spain we used to drink a lot of scented Agua Fresca on summer days. It's very refreshing. You should also try it with orange or melon. So good!