Crate water bottles.

There's a thread a little further down on this forum where different options for offering water inside a crate, including those Lixit bottles, are discussed. You can find that here - http://www.germanshepherds.com/forum/ubbthreads.php?ubb=showflat&Number=706265&page=1#Post706265

I use a Lixit bottle on my crate, hooked to the door of it. It does drip, but not heavily or consistently.

After trying a couple of plastic models that were very poorly made and did not hook to the wire crate very well, I found a glass bottle with one flat side and a simple but effective fastening system at a local pet store. It even has a little floating duck inside so you can see the water level at a distance. The spout/tube is a little small for a large dog, but it works nice and allows him to drink a little during the day.