If you like to carry a water bottle around, here is a little tip. there are approximately 33.8 oz in a liter. plastic water bottles are usually 12-16 fluid oz. To reach the 2 liter mark, drink 4.5 to 5 water bottles each day. Good Luck!
Try taking a 2 liter coke bottle and cleaning it out to make sure there is no more coke. Then fill it with water and you will have a perfect amount =)
Try drinking 8 to 9 cups a day that should equal out to the 2L.
You can download an app called iDrated for the iPhone and this not only encourages you to drink more water but also reminds you and keeps a log of how much water you drink :)
Try drinking a 500ml bottle or about a pint with each meal, plus another 500ml when you would normally have a tea / coffee break, e.g. morning break at work. When you are first starting out it may be preferable to drink more earlier in the day and taper of...