For those looking for something different for bong water...

Try using Nestle's Pure Life flavoured waters (I'm sure it works with any flavoured water). It makes for a nice treat. They give the smoke a pleasant, fruity taste that makes me want to compare it to smoking a flavoured cigar, and the water doesn't stink even if the bong's been used a few times. If the flavour is too strong, just dilute it with normal water.

vodka makes the smoke nice and cool like menthol just make sure you mix it 50% with water.

grape juice is good, and if you feel like it, make a water bottle bong and put slightly watered down honey in it, it looks cool when you watch people take hits