What are your tips for drinking 8, 8 oz glasses of water a day?

Here is mine and it is working for me. I always had a problem making sure I got my water in for the day. Now this is what I do and I am much better at get my water intake.

I take 4, 16 oz plastic cups and stack them inside each other. On each cup I write on them from numbers 1 to 4 and stack them inside of each other. After I finish my first cup it goes inside the top cup and the cup on the outside would be numbered number 2.

What do you do to make sure you get your water intake?