This weeks challenge is going to focus around water. I found this short YouTube tutorial on photographing water drops. I played around with this concept last year and got some really great images. I didn't use as many lights as this tutorial shows. It can be done with the MOST basic non/photography specific equipment. If you're up for a challenge have a go at 'water drop' photography. It really is amazing the results you can get. Don't feel like you HAVE to do this as your water challenge. This is just a suggestion to get you playing with lighting etc. The most important thing is to have fun and share images with each other.
If you're not a fan of Heavy Metal music
I suggest turning of your sound before watching this video.