There are actually several fairly promising paths being researched and trying to get approval, but type 1 isn't something that just goes away when you lose weight or try diet x. Islet cell transplants, artificial pancreas (pump and real time monitoring), etc.
I think we'll all agree that water is best, but sometimes it is a bit harder to get kids to drink just plain water. We also try to keep some flavored water around so he has enough options.