There is no right or wrong way to drink Scotch whisky - it's all down to personal taste at the end of the day. However, here are a few suggestions:
Many who drink Scotch whisky neat say they do not want to spoil the taste by adding water. However, equally as many will say that adding a touch of water, particularly if it is pure, soft spring water, (ideally the same spring water used in the making of the particular whisky!) serves to enhance the distinctive aroma and flavour of a whisky. Tap water may contain high amounts of chlorine and therefore would not complement any whisky - your best bet is to opt for bottled Scottish mineral water!
Adding ice to a whisky is such as a shame because it will only dull the fine taste and wonderful aromas. Similarly, carbonated water is not an ideal accompaniment for whisky as it may interfere with the aromas also.
Adding mixers such as ginger ale, soda and even coca cola, is a popular trend, however it begs the question - why drink whisky at all if you need to mask the taste?