I bought a 1L water bottle (that's 4 cups of water) and I keep track of how many times I drink the whole bottle in a day. If I only drink two full bottles, that's still my minimum water intake for the day! It seems less daunting in a container that I have to fill less often.
When out to meals, I often ask for tap water, first and sip on that for a while, even if I was thinking of ordering another drink. Oftentimes, once I've started with my water, I have lost the impulse to get another drink and suddenly it's time to order food, so I just keep the refills of water coming, instead!
What are your tips on getting your water intake each day? And how do you avoid drinking empty calories?