Ideas to drink more water...

I noticed last week, that when I forgot to put the lid back on my covered hot/cold cup I use at work (to prevent spills on their computer), that I drank more. When I noticed this, I thought about how it is uncomfortable and more of an effort to drink out the cup, w/ that little hole. I don't use straws at all, like I use to before surgery. Now, this cup is very helpful in keeping coffee hott, but now that I've noticed I drink better with the lid off...this is what I'm doing and I'm drinking more. So it made me think..if something so little could help me drink more..does anyone else have some tricks to that you find helps you?