I am sorry, I am going to be blunt, and straight to the topic.
Are you kidding me?...Who the hell diagnosed a 5 year old with bipolar???...A person, I hope!
Do you want your child to live well?...Good!...Get him off all the junk medication he is on, take all the pop away from his diet, right now!...He is to drink water, not juice, not pop! His weight, divided by two, in ounces, is as much water as he needs everyday!...So, if he is 40 lbs, divided by two is 20, in ounces, so, he would need 20 ounces of water a day, got it?
Now, another pertinent question, when was he vaccinated last?...There must have been a vaccination there, and I bet he is suffering from side-effects!...Welcome to the real world. If so, it needs to be antidoted.
Another point, he needs fish oils, and soon!
If you take this message serious enough, you could email me, and I will talk to you further about it. He can be treated, really fast and effectively, in a matter of a few months, but you need to act now, take charge, and stop listening to the doctors you are listening to!...Really!
Good luck!