Yeah that's an expensive option especially since they will be clean for about 30 seconds. Shavings are fine. You can put the watere up on something like a brick to get it up off the floor a little. Just make sure everyone can reach it and it can't fall over.
Congratulations! You have started a wonderful hobby with a great group of people here.
Just don't break rule #1. Don't get the chicks before the coop is ready. You think you have plenty of time but it goes FAST.