I recently saw a post on Facebook from Tone It Up in which they suggested to put grapefruit along with strawberries in their water for flavor. I use strawberries (and sometimes limes) on a regular basis in my water but I had never tried the grapefruit. I filled a 2-liter pitcher with water and peeled one grapefruit. I sliced it up and put it in the water along with some frozen strawberries. I let this set all day before tasting...it needed more time. After the fruit soaked overnight the water tasted AMAZING! You can add a little Stevia if you want it to be sweeter.
One last thing...after the grapefruit peel has been simmering all day it will be soft enough to send down the garbage disposal with hot water. It creates the BEST citrus smell ever!
Have a great day! :)