My current dog is crate trained, but we only use the crate now when traveling. We have a crate crock that attaches to the crate door and we can leave some water for her. Here's a link:
http://www.petsmart.com/product/index.jsp?productId=2754647
The crate crock works well if it is attached to the door tightly. We've only had one spill and that was when I didn't have the wingnut tightened enough. You can also get battery powered crate fans to help keep a dog cool.
As to whether your dog needs water in the crate.... I always use myself as a guideline. If I would anticipate needing a drink during the time the dog is crated, I'd leave some water. I'd also consider if there was a chance for a delay in getting back home. I don't think you pushed it this time. At 9 months the pup should be well-house-trained, and 5 hours isn't a tremendous amount of time. My dog was crate-trained, but not house-trained when we got her and she spent nights in her crate--longer than 5 hours.
And a link to a crate fan:
http://www.gundogsonline.com/dog-crates/plastic-dog-crate/metro-airforce-dog-crate-fan.html