Normally, when you eat out, restaurents tend to add a little something to their plain water. Like few slices of lemon into a full flask of water. One such restaurent I visit in Singapore that serve this way is Ajitei at Bugis Junction. Interestingly, when I recently visited Mdm Kwan, a restaurent in Mid Valley at KL, Malaysia, I noticed that strawberry is used instead. The water has a hint of strawberry taste. And it looks really cool!
If you do know of better ways to decorate water, do share.