I'm glad to hear he's improving. I was never conerned about extra water in my dragons poops but then their poops are formed, so can understand your concerns and no, it won't do him any harm to get other veggies than squash for awhile. I'm just impressed with his eating habits! Three of my adults have to be hand fed, drag but there you go, I think they'd starve themselves to death if I didn't feed them. I'm hoping, once spring gets here, they'll start eating on their own again.
It's nice to have a journal of your dragon, I've been running a thread since 2010 and I love that I have previous posts about all the dragons I've loved and now lost. My new little guy Imp is really doing well, so that's a positive sign.
So pics when you have a minute. And yes, an MVB for his basking spot outside his tank will do him good. I have one on top of the ramp for them to sit under and a TV above that they can watch and they do. It's on Disney Jr and they just love the cartoons.