We much preferred the Osprey one. The trick is attaching something to the tube to let you position it. Google Nite Ize Original Gear Tie, 32-Inch. I had something similar. I used pieces of velcro to attach the drinking tube to to the tie. I used large safety pins to stabilize the tube assembly. The drinking bag hung on the bed frame behind her foam wedge. I secured the tube to the wedge and then with trial and error bent it up to where she could get at the bite valve. If you can afford the Giraffe one, maybe it would be the way to go as it is designed to solve the positioning problem. If I'd known about it I would have tried it.
Again, hope this helps. Ask more questions if you need and I'll try to help. All the best to you.