Drinking enough water is really important, so I love the part of the WaterAid site which reminds us how important water is. You can use the interactive form to estimate how much water you should be drinking, download a little pop up programme to remind you to drink water, and find tips and games too. It's definitely worth a visit.
All that is free, but while you're there you might like to think about making a donation to WaterAid's work in many different countries in Africa and Asia.