For me it was a pretty major issue, because I have never been much of a water drinker to start with. I always had something to drink in hand, just never water, coffee, tea, pop, where my standards.
Couple things that helped me drink more water. One bf gave me a very nice over priced water bottle, ok I admit it I love the thing, and because I knew how much he paid for it I damned sure was gonna use it. The other thing I did was I got some water flavor drops from Capella. Much cheaper than flavored waters at the store, I could mix what I wanted, and they don't use all the food coloring some places use.