You can add different fruits like strawberry, kiwi etc. You can check this link for options: http://www.diyncrafts.com/7075/health/20-delicious-detox-waters-cleanse-body-burn-fat
You can use or add cucumber. it will sweeten your water and will keep you hydrated while lemon will boost your immune system and cleanse out harmful toxins.
Try mint leaves and oranges. They said it's good to include in your infused water: http://www.loseweightbyeating.com/infused-water/
Cucumber, mint, basil leaves